已知:AB为⊙O的直径,
,D为弦AC上一动点(不与A、C重合).
![](https://img.xkw.com/dksih/QBM/2022/2/13/2915419299782656/2924291415859200/STEM/23002ffc89054cb3b858c6683abccedd.png?resizew=309)
(1)如图1,若BD平分∠CBA,连接OC交BD于点E.
①求证:CE=CD;
②若OE=2,求AD的长.
(2)如图2,若BD绕点D顺时针旋转90°得DF,连接AF.求证:AF为⊙O的切线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9995a90d542805442b8118206a4aa26f.png)
![](https://img.xkw.com/dksih/QBM/2022/2/13/2915419299782656/2924291415859200/STEM/23002ffc89054cb3b858c6683abccedd.png?resizew=309)
(1)如图1,若BD平分∠CBA,连接OC交BD于点E.
①求证:CE=CD;
②若OE=2,求AD的长.
(2)如图2,若BD绕点D顺时针旋转90°得DF,连接AF.求证:AF为⊙O的切线.
更新时间:2022-02-25 23:49:01
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【推荐1】如图,AB是⊙O的直径,点C为⊙O上一点,延长BC到D,使BC=CD,连接AD,过点C作⊙O的切线,交AD于点E.
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【推荐2】如图,AB=BC,以BC为直径作⊙O,AC交⊙O于点D,过D作DE⊥AB于点F,交CB的延长线于点E.
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