题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151853-92310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151853-34825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151853-46365.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151853-96834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151853-81382.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151854-10831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151854-95513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151854-80149.png)
连结
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151854-26402.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151855-88643.png)
(1)求证:△
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151855-54146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151855-11574.png)
(2)若∠
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151855-18557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151856-60858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151856-24816.png)
答案
(2) ∵∠
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151856-44686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151856-17047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151857-97020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151857-64425.png)
由(1)知,∠
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151857-85549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151857-69396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151857-85549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151858-78350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151857-97020.png)
解析
(2)由(1)得到∠BAD﹦∠CAD",∠DAE=∠D"AE,而∠BAC﹦120°,所以∠BAC=∠DAD"﹦120°,
则∠DAE=
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151858-78350.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151845-15983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151835-55348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151831-57901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151831-20108.png)
A.60° | B.105° | C. 120° | D. 135° |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151832-29780.jpg)
A.1个 | B.2个 | C.3个 | D.4个 |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151829-36626.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151824-86928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151824-59579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151824-11306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151825-60919.png)
(1)点
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151824-11306.png)
(2)求点B所经过的路径长.
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106151825-54401.jpg)
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