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【329373】《三角形内角和定理(2)》专项练习—解答题1

时间:2025-01-21 13:00:09 作者: 字数:1978字
简介:

5.5 三角形内角和定理(2

1.如图,已知: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,求 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 的度数.

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

2.如图,已知:在 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 中, <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,求 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 的大小.

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

3.如图,P <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 内一点,延长BPAC于点D.用符号“<”表示 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 的关系.

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

4.如图,已知:D <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 的外角平分线与BA的延长线的交点.求证: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

5.如图,已知:P <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 内一点.求证: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>


6.已知:如图,在 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 中,AD平分 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,垂足为E

求证:(1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ;(2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

7.如图,在 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 中, <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,垂足为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 平分 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,求 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 的度数.

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

8.如图,在 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 中,DBDC分别平分内角 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>CG分别平分外角 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,求 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 的度数.


 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

9.如图,已知在五角形 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 中,求证: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>


 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

10.如图, <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 中, <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>DBC上一点,(且不与 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 重合)

求证: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>


 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

11.如图, <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 的两个外角 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 的平分线交于D点.

求证: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>





12.如图, <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 中, <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> 平分 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

求证: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>



参考答案

190°

2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> (提示: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,∴ <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ).

3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

4 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,又 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,∴ <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

5.连结AP并延长到D

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> (三角形的一个外角大于它不相邻的一个内角),

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,即 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

6.提示:根据三角形的外角大于和它不相邻的内角.

7 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

8 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

9 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,又 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

10 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,又 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,∴ <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

11 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,即 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

12 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a> ,∴ <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/173/" title="解答" class="c1" target="_blank">解答</a> <a href="/tags/387/" title="三角形" class="c1" target="_blank">三角形</a> <a href="/tags/903/" title="内角" class="c1" target="_blank">内角</a> <a href="/tags/912/" title="定理" class="c1" target="_blank">定理</a> <a href="/tags/920/" title="三角" class="c1" target="_blank">三角</a>




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