题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135711-68245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135711-32403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135711-85881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135712-69138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135712-51596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135712-36951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135712-66419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135713-57144.png)
A.49° | B.50° | C.51° | D.52° |
答案
解析
试题分析:根据翻折可知:∠A=∠DOE、∠B=∠HOG、∠C=∠EOF,而∠A+∠B+∠C=1800,∠1=1290,所以∠2=3600-1800-1290=510.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135706-78510.png)
A.角 | B.等边三角形 | C.平行四边形 | D.圆 |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135700-56909.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135653-79166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135654-33132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135654-26173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135654-63352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135654-16060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135655-50521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135655-36214.jpg)
小明在研究中心对称问题时发现:
如图1,当点
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-93735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-47126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-20357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-13005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-40907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-93735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-78907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-93592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-78907.png)
如图2,当点
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-20357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-82740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-47126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-20357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-13005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-13005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-82740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-91181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-91181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135641-20357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-37309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-37309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-82740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-55108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-32718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-14772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-36564.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-22980.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135643-34172.jpg)
(1)请在图2中画出点
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-37309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-32718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-32718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-14772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-14772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-32718.png)
(2)如图3,在平面直角坐标系xOy中,当
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135643-87514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135643-42932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135643-57665.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135643-99187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135643-30746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135643-93988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135643-93988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135644-98117.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135644-76475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135644-76475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135644-56950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135644-12879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135644-12879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135644-76082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135644-96580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135645-36069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135642-91181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135645-97500.png)
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