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【319958】【分层训练】3.4 画角 四年级上册数学同步练习 人教版(含答案)

时间:2025-01-08 00:16:17 作者: 字数:5547字
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第三单元:角的度量

第4课时:画角

班级: 姓名: 等级:

【基础训练】

一.选择题

1.下面的角中,能用一副三角尺画出来的是(  )

A.10度 B.15度 C.20度 D.25度

2.下列各度数的角,不能用一副三角尺画出来的是(  )

A.75° B.165° C.160°

3.把两个锐角拼在一起,拼成的角不可能是(  )

A.锐角 B.钝角 C.平角

4.如图的两个三角尺,一个是老师用的,一个是小明用的.∠1和∠2相比,结果怎样?(  )

A.∠1和∠2相等 B.∠1比∠2大 C.∠1比∠2小

5.把平角分成两个角,其中一个角是锐角,另一个角是(  )

A.锐角 B.直角 C.钝角 D.说不清

二.填空题

6.用三角板画一个105度的角,应该用三角板依次画出   度和   度的角.

7.一块三角尺中有   个角,其中直角有   个,剩下的角都是   角.

8.请写出能用三角板画出的度数:   .

9.画角的步骤:

(1)定线:先画一条    ,使量角器的    和    的端点重合,   刻度线和射线重合.

(2)定点;在量角器上找到对应的    ,并点上一点.

(3)连线:以画出的射线的端点为端点,过刚画的点,画一条    .

10.画角通常有两种方法:一种是用   画角;另一种是用   画角。

三.判断题

11.用一副三角板可以画一个15°的角.   .

12.画一个75°的角,可以用量角器画,也可以用一副三角板画.   .

【拓展运用】

四.操作题

13.用量角器画出120度的角.

14.用一副三角板画一个105°的角.



































参考答案

一.选择题

1.解:因一副三角板中的各个角的度数分别是30°、60°、45°、90°把它们进行组合,可得到的角有60°﹣45°=15°,60°+45°=105°,60°+90°=150°,90°+45°=135°,90°+30°=120°,30°+45°=75°;

所以给出的角度中只能拼出15度的角.

答案:B.

2.解:一副三角尺的角度有90°,45°,30°,60°,

A、45°+35°=75°,即能用三角尺画出75°的角;

B、45°+90°+30°=165°,即能用三角尺画出165°的角;

C、根据90°,45°,30°,60°的组合不得出160°的角,即不能用三角尺画出160°的角;

答案:C.

3.解:A、锐角,可以拼成,例如:30°+40°=70°.

B、钝角.可以,例如:89°+87°=176°.

C、平角,不能,例如:89°+88°=177°.

答案:C.

4.解:因为角的大小与角的两边张开的角度有关,所以∠1和∠2相等.

答案:A.

5.解:平角是180度,其中锐角是大于0°,小于90°的角,用“180﹣锐角”所得的角的度数大于90度,所以另一个角是钝角;

答案:C.

二.填空题

6.解:如上图所示,

让等腰直角三角形的一个锐角和另一个直角三角形的较大的锐角拼在一起即可.(45°+60°=105°).

答案:45;60.

7.解:根据生活经验可知,一块三角尺中有3个角,其中直角有1个,剩下的角都是锐角。

答案:3、1、锐。

8.解:①可以直接画出的有:

30°、45°、60°、90°;

②通过和或差画出的有:

45°﹣30°=15°;

45°+30°=75°;

45°+60°=105°;

45°+90°=135°;

60°+60°=120°;

90°+30°+45°=165°;

90°+90°=180°;

60°+90°=150°;

答:可以画出15°、30°、45°、60°、75°、90°、105°、120°、135°、150°、165°、180°的角,共12个.

答案:15°、30°、45°、60°、75°、90°、105°、120°、135°、150°、165°、180°.

9.解:(1)定线:先画一条 射线,使量角器的 中心和 端点的端点重合,0刻度线和射线重合.

(2)定点;在量角器上找到对应的 度数,并点上一点.

(3)连线:以画出的射线的端点为端点,过刚画的点,画一条 射线.

答案:射线,端点,0;度数;射线.

10.解:画角通常有两种方法:一种是用量角器画角;另一种是用三角板画角。

答案:量角器,三角板。

三.判断题

11.解:因一副三角板中的角有30°、45°、60°90°,其中60°﹣45°=15°;

所以用45°的角和60°的角可画出15°的角.

答案:√.

12.解:根据题干分析可得,75度的角,可以利用量角器画角,

且75°=45°+30°,也可以利用三角板画角,原题说法正确.

答案:√.

四.操作题

13.解:如图所示:



14.解:让等腰直角三角形的一个锐角和另一个直角三角形的较大的锐角拼在一起,画出这个角如下图所示,

45°+60°=105°;



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第三单元:角的度量 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

4课时:画角 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

班级:  <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a> 姓名: 等级: <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

【基础训练】 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

一.选择题 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

1.下面的角中,能用一副三角尺画出来的是(  ) <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

A10 B15 C20 D25 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

2.下列各度数的角,不能用一副三角尺画出来的是(  ) <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

A75° B165° C160° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

3.把两个锐角拼在一起,拼成的角不可能是(  ) <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

A.锐角 B.钝角 C.平角 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

4.如图的两个三角尺,一个是老师用的,一个是小明用的.∠1和∠2相比,结果怎样?(  ) <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>  <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

A.∠1和∠2相等 B.∠1比∠2 C.∠1比∠2 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

5.把平角分成两个角,其中一个角是锐角,另一个角是(  ) <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

A.锐角 B.直角 C.钝角 D.说不清 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

二.填空题 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

6.用三角板画一个105度的角,应该用三角板依次画出   度和   度的角. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

7.一块三角尺中有   个角,其中直角有   个,剩下的角都是   角. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

8.请写出能用三角板画出的度数:    <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

9.画角的步骤: <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

1)定线:先画一条    ,使量角器的        的端点重合,   刻度线和射线重合. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

2)定点;在量角器上找到对应的    ,并点上一点. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

3)连线:以画出的射线的端点为端点,过刚画的点,画一条     <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

10.画角通常有两种方法:一种是用   画角;另一种是用   画角。 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

三.判断题 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

11.用一副三角板可以画一个15°的角.    <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

12.画一个75°的角,可以用量角器画,也可以用一副三角板画.    <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

【拓展运用】 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

四.操作题 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

13.用量角器画出120度的角. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

14.用一副三角板画一个105°的角. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>  <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

参考答案 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

一.选择题 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

1.解:因一副三角板中的各个角的度数分别是30°60°45°90°把它们进行组合,可得到的角有60°45°15°60°+45°105°60°+90°150°90°+45°135°90°+30°120°30°+45°75° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

所以给出的角度中只能拼出15度的角. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

答案:B <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

2.解:一副三角尺的角度有90°45°30°60° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

A45°+35°75°,即能用三角尺画出75°的角; <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

B45°+90°+30°165°,即能用三角尺画出165°的角; <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

C、根据90°45°30°60°的组合不得出160°的角,即不能用三角尺画出160°的角; <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

答案:C <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

3.解:A、锐角,可以拼成,例如:30°+40°70° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

B、钝角.可以,例如:89°+87°176° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

C、平角,不能,例如:89°+88°177° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

答案:C <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

4.解:因为角的大小与角的两边张开的角度有关,所以∠1和∠2相等. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

答案:A <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

5.解:平角是180度,其中锐角是大于,小于90°的角,用“180锐角”所得的角的度数大于90度,所以另一个角是钝角; <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

答案:C <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

二.填空题 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

6.解:如上图所示, <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

让等腰直角三角形的一个锐角和另一个直角三角形的较大的锐角拼在一起即可.(45°+60°105°). <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

答案:4560 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

7.解:根据生活经验可知,一块三角尺中有3个角,其中直角有1个,剩下的角都是锐角。 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

答案:31、锐。 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

8.解:可以直接画出的有: <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

30°45°60°90° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

通过和或差画出的有: <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

45°30°15° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

45°+30°75° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

45°+60°105° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

45°+90°135° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

60°+60°120° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

90°+30°+45°165° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

90°+90°180° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

60°+90°150° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

答:可以画出15°30°45°60°75°90°105°120°135°150°165°180°的角,共12个. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

答案:15°30°45°60°75°90°105°120°135°150°165°180° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

9.解:(1)定线:先画一条 射线,使量角器的 中心和 端点的端点重合,0刻度线和射线重合. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

2)定点;在量角器上找到对应的 度数,并点上一点. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

3)连线:以画出的射线的端点为端点,过刚画的点,画一条 射线. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

答案:射线,端点,0;度数;射线. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

10.解:画角通常有两种方法:一种是用量角器画角;另一种是用三角板画角。 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

答案:量角器,三角板。 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

三.判断题 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

11.解:因一副三角板中的角有30°45°60°90°,其中60°45°15° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

所以用45°的角和60°的角可画出15°的角. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

答案:√. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

12.解:根据题干分析可得,75度的角,可以利用量角器画角, <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

75°45°+30°,也可以利用三角板画角,原题说法正确. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

答案:√. <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

四.操作题 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

13.解:如图所示: <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>  <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

14.解:让等腰直角三角形的一个锐角和另一个直角三角形的较大的锐角拼在一起,画出这个角如下图所示, <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

45°+60°105° <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>  <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/245/" title="训练" class="c1" target="_blank">训练</a>

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