题目
题型:不详难度:来源:
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034452-50064.png)
(Ⅱ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034452-85536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034453-55836.png)
答案
解析
(1)连结
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034453-53264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034453-18615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034453-95265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034453-13838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034454-49522.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034453-18615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034454-68501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034454-72959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034454-21403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034455-82319.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034455-45317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034455-30141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034455-71817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034456-97264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034456-54542.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034456-82396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034456-21556.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034456-85700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034452-50064.png)
(2)由(1)知
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034455-71817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034457-53747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034457-39107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034456-21556.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034457-23816.png)
由(1)知
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034457-67176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034458-98519.png)
核心考点
试题【如图,已知⊙O和⊙M相交于A.B两点,AD为⊙M的直径,直线BD交⊙O于点C,点G为弧BD中点,连结AG分别交⊙O.BD于点E.F连结CE。(Ⅰ)求证:;(Ⅱ)】;主要考察你对圆的方程等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034446-78081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034446-89740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034446-55947.png)
(2)求与圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034446-48007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034447-69374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034439-32077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034440-88205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034440-75124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034440-85343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034440-62384.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034440-88205.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034436-18099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034436-26562.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
A.![]() | B.sin0.5 | C.2sin0.5 | D.tan0.5 |
(1)求证:AD//EC;
(2)若AD是⊙O2的切线,且PA=6,PC =2,BD =9,求AD的长。
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034423-20035.png)
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