题目
题型:不详难度:来源:
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131834-46095.png)
解析
解答:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131835-14356.png)
AB∥CD,∠B=60°
∴∠C=∠B=60°,
故答案为:60°.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131819-31067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131819-13487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131819-48857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131820-22268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131820-43437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131820-43233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131820-60535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131820-93368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131821-94058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131821-32997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131821-61244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131821-48882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131809-59687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131809-83783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131810-18771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131810-23171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131810-90542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131810-64765.png)
A、0个 B、1个 C、2个 D、3个
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131757-75256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131757-25389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131757-80045.png)
解:∵EF//AD,(已知)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131757-25389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131757-38788.png)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131757-75256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131757-25389.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131757-75256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131758-57446.png)
∴AB//______,(____________________________)
∴∠DGA+∠BAC=180°.(_____________________________)
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