(几何证明选讲选做题)如图,点
都在圆O上,过点C的切线交AB的延长线于点D,若
,
,
,则线段AC的长为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://img.xkw.com/dksih/QBM/2015/3/24/1572021623480320/1572021629394944/STEM/f7a5bb9ba4ec41bdb7890511914e1f37.png?resizew=142)
更新时间:2016-12-03 10:29:06
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【知识点】 几何证明选讲
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