题目
题型:不详难度:来源:
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040649-90124.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040649-98460.png)
∵AB=AC=5,BC=8,∴BD=4,
∴在Rt△ABD中,AD= AB2-BD2 =3,
当点O在A点上方时,OD=AO+AD=4+3=7,
在Rt△OBD中,半径OB=
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040650-52558.png)
当点O在A点下方时,O′D=AO′-AD=4-3=1,
在Rt△OBD中,半径O′B=
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040650-61779.png)
故答案为
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040649-90124.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040645-23463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040645-22089.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040645-57767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040637-69540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040638-58901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040637-69540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040638-29894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040638-39495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040638-34570.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040638-29894.png)
(2)请直接写出图中某3条线段之间的等量关系式,只要写出3个。(添加的辅助线不能用)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040639-96680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040628-28976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040629-46925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040629-87830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040629-37563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040629-81486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040629-46925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040629-31266.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040629-38947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040630-25367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040629-37563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040630-72224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040630-31494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040630-51186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040630-43262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040631-99788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040631-38071.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040623-76091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105040620-20018.jpg)
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