题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040827-19530.png)
答案
解析
试题分析:△ABC中,∠A=40°,
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040828-92326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040828-67564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040828-77843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040829-73128.png)
点评:本题考查三角形、四边形的内角和定理,掌握内角和定理是解本题的关键
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040824-64661.png)
(1)找出图中一对全等的三角形,并证明;
(2)求证:四边形ABCD是矩形.
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040817-79903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040817-97022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040817-66232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040817-55623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040818-11445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040818-74129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040818-80681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040818-62949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040819-27054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040819-59309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040819-51321.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040819-19223.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040819-21865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040819-12709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040820-86377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040820-60453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040820-92088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040809-57449.png)
求证:(1)△ACE≌△BCD;
(2)AE∥BC.
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040755-85124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040755-88198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040755-40991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040755-31891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040755-24599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040755-50688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040755-24599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040756-12901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040756-65445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040756-41127.png)
(1)如图1,试问线段
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040756-84258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040756-18287.png)
(2)如图1,是否存在
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040756-56205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040756-84258.png)
继续以下探索:
(3)如图2,以
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040756-46004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040756-51011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040756-12901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040757-78011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040757-34299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040757-92332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040757-28685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040757-82173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040757-45378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040758-25893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103040758-95287.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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