题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054142-26863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054143-63942.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054143-53560.png)
解:正六边形的半径为20cm,
则它的外接圆的半径也是20cm,
它的内切圆的半径=20×
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054143-69616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054144-60441.png)
所以圆环的面积=π[202-(10
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054144-60441.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054136-84749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054136-15622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054137-55816.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054137-63289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054137-18257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054137-68014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054136-15622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054138-61508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054138-19842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054138-77167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054139-67849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054129-45404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054129-67311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054129-90359.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054129-85510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054129-67311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054129-44165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054130-90975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054129-44165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054130-23667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054130-86354.png)
小题1:⑴求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054130-87364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054129-67311.png)
小题2:⑵当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054131-16245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054123-40286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054117-93051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054117-27600.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054117-33257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054118-91254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054118-67427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054118-50512.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054118-78557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054118-91254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054119-75938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054119-96916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054119-31943.png)
(1)________________;(2)________________;(3)________________.
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054120-19925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054111-65381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054112-91367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054112-80052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054112-91367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054112-22235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054113-42630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054112-91367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054113-79771.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054113-16117.png)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054113-37299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105054114-73326.png)
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