题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041826-77818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041826-52094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041827-46672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041827-50265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041827-46672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041827-57872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041827-95052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041827-97546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041827-50265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041827-41589.png)
小题1:求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041827-59695.png)
小题2:若
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041827-26104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041827-77088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041827-68655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041828-83200.png)
答案
小题1:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041828-75654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041827-97546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041828-50123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041828-56738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041828-57537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041828-43446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041828-13073.png)
小题2:设半径为
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041828-84078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041828-49324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041829-95830.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041829-56393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041829-86326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041829-49297.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041829-98862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041830-16654.png)
解析
(2)求中阴影部分的面积,可以转化为△ABC的面积减去半圆的面积.
核心考点
举一反三
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041818-35274.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041814-74062.png)
A.10πcm2 | B.25πcm2 | C.60πcm2 | D.65πcm2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041811-67083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041803-15777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041803-58379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041803-57281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041803-83716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041804-64643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041804-28558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041804-45499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041804-18960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041805-67095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041804-28558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041805-98566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041805-81467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041805-73538.png)
小题1:求
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041804-28558.png)
小题2:求线段
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041806-81882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041806-93322.png)
A.16厘米 | B.10厘米 | C.6厘米 | D.4厘米 |
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