题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102232121-59046.png)
(1)求证:CD是⊙O的切线;
(2)若⊙O的半径为4,求AE的长.
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102232121-11112.png)
解析
(2)因为AB是直径,所以∠ADB=90°,OE⊥BD,所以OE
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102232122-83313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102232122-56899.png)
核心考点
试题【如图,AB是⊙O的直径,点C在AB延长线上,点D在⊙O上,连接AD,BD,BO=BC=BD,OE⊥BD于E,连接AE.(1)求证:CD是⊙O的切线;(2)若⊙O】;主要考察你对相似图形等知识点的理解。[详细]
举一反三
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经过思考,小明展示了一种正确的解题思路:过
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102232051-99965.png)
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(1) 请按照小明的思路写出求解过程.
(2) 小东又对此题作了进一步探究,得出了
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102232056-30482.png)
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