题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001600-53420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001600-98817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001600-54858.png)
(1)若⊙
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001600-53420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001600-30533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001600-98817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001601-82260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001600-30533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001601-82260.png)
(2)若扇形的半径为12,求图中阴影部分的面积.
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001601-65733.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001601-68390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001601-43952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001601-52488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001600-30533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001601-82260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001602-36144.png)
(2)扇形的半径为12,即
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001602-97716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001602-88660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001601-82260.png)
解:(1)连接
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001601-68390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001601-43952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001602-78765.png)
在Rt△
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001601-52488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001603-43117.png)
整理得
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001603-65957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001603-28357.png)
(2)∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001602-97716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001602-88660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001603-34847.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001604-57029.png)
核心考点
试题【如图,已知扇形AOB,OA⊥OB,C为OB上一点,以OA为直径的半圆与BC为直径的半圆相切于点D.(1)若⊙的半径为,⊙的半径为,求与的比;(2)若扇形的半径为】;主要考察你对圆的认识等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001554-30250.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001548-75607.png)
(1)试写出点A,B之间的距离d(厘米)与时间t(秒)之间的函数表达式;
(2)问点A出发后多少秒两圆相切?
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001539-69333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001539-13891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001540-39787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001540-94287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001540-39787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001540-66900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001540-17812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001540-42319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001541-40842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001541-97350.png)
A.70° | B.110° | C.90° | D.120° |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001533-10139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001533-25652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001533-42120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001533-29889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001534-22825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001534-66158.png)
A.10 cm | B.20 cm |
C.24 cm | D.30 cm |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001526-85244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105001526-88256.png)
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