当前位置:首页 > 七年级 > 数学试卷

【332219】1.1 第1课时 正切与坡度

时间:2025-01-21 12:28:55 作者: 字数:1514字
简介:

1.1 锐角三角函数

1课时 正切与坡度

1.在△ABC中,∠C=90°AC=4BC=3,则tanA的值是(  )

A  <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> B  <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> C  <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> D <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a>

2.如图,在3×3的正方形的网格中标出了∠1,则tan∠1的值为(  )

 A <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> B  <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> C  <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> D  <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a>

 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a>

3.如图,河坝横断面迎水坡AB的坡比 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> (坡比是坡面的铅直高度BC与水平宽度AC之比),坝高BC=3m,则坡面AB的长度是(

A9m B6m C <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> m D <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> m

 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a>

4.如图是拦水坝的横断面,斜坡AB的水平宽度为12米,斜面坡度为12,则斜坡AB的长为(

A. <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> B. <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> C. <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> D24

Group 190

5.如图,在直角坐标系中,点A的坐标是(23),则tanα的值是(  )

 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a>


  1.  <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> B <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> C  <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> D  <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a>


6.如图,△ABC中,∠C=90°AC=5BC=12,则tanA=______

 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a>

7.Rt△ABC中,∠C=90°,若AC=5tanA=2,则BC=  

8.如图,已知梯形ABCD中,AB∥CDAB⊥BC,且AD⊥BD,若CD=1BC=3,那么∠A的正切值为  

 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a>

9.在△ABC中,∠C=90°BC=8cmtanA= <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> ,求AC的长.








10.如图,某大楼的顶部树有一块广告牌CD,小李在山坡的坡脚A处测得广告牌底部D的仰角为600.沿坡面AB向上走到B处测得广告牌顶部C的仰角为450,已知山坡AB的坡度 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a>AB=10,AE=15米. <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a> 是指坡面的铅直高度BH与水平宽度AH的比)
1)求点B距水平面AE的高度BH;(2)求广告牌CD的高度.

 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/1174/" title="坡度" class="c1" target="_blank">坡度</a> <a href="/tags/1175/" title="正切" class="c1" target="_blank">正切</a>