题目
题型:不详难度:来源:
A.角 | B.等边三角形 | C.平行四边形 | D.圆 |
答案
解析
试题分析:角、等边三角形是轴对称图形;平行四边形是中心对称图形;圆既是中心对称图形又是轴对称图形,故选D.
核心考点
举一反三
![](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)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135627-55729.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135628-62961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135628-14761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135628-99606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135628-49629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106135628-33190.png)
A.4π | B.3π | C.2π | D.π |
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