题目
题型:不详难度:来源:
答案
解析
∴∠A=∠C=40°,
∴∠B=180°-∠A-∠C=100°;
②AC=BC,
∴∠A=∠B=40°;
(2)当∠A是顶角时,AB=AC,
∴∠B=∠C=
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060045-34275.png)
故答案为:40°或70°或100°.
核心考点
举一反三
(1)求这个梯子顶端距地面有多高。
(2)如果梯子的顶端下滑4 m(CD位置),那么梯子的底部在水平方向也滑动了4 m吗?为什么?
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060041-59423.png)
(1)试说明:FG=
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060035-27153.png)
(2)①如图(2),BD、CE分别是△ABC的内角平分线;②如图(3),BD为△ABC的内角平分线,CE为△ABC的外角平分线。
则在图(2)、图(3)两种情况下,线段FG与△ABC三边又有怎样的数量关系?请写出你的猜想,并对其中的一种情况说明理由。
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060036-30532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060030-94323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060030-86545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060030-73917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060031-48139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060031-99336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060031-40175.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060031-49375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060032-48318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060032-15926.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060032-38253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060032-99868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060024-14226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060024-36770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060024-33802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060024-72725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060025-27992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060025-76072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060025-61275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060025-42424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055949-24104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055949-52161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055949-82432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055950-27050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055950-24293.png)
(1)先用尺规作出符合要求的点
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055949-82432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055950-60814.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055951-76196.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055951-98362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055951-62516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055951-45644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055952-62655.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055952-55582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055952-86880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055952-22821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055953-22605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055953-38712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055953-32585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103055953-17991.png)
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