名校
1 . 如图,
,垂足分别为
,若
,则
的长为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5be3facae1ecc4cc1c2cb96280f92ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d14af8de7575341e02ee92cd0e33312b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e493fab43e5cf7aa9675e0c40fe15fc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2017/8/18/1754646343540736/1754861942030336/STEM/0dce344eb15b4d779ecf09556f41a6d2.png?resizew=118)
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2014·陕西西安·二模
2 . 如图,已知
是⊙
的切线,
为切点.
是⊙
的一条割线,交⊙
于
两点,点
是弦
的中点.若圆心
在
内部,则
的度数为___ .
![](https://img.xkw.com/dksih/QBM/2014/4/21/1571634623266816/1571634628968448/STEM/dc2c623e9f514c12b26cbd3e10635e33.png?resizew=25)
![](https://img.xkw.com/dksih/QBM/2014/4/21/1571634623266816/1571634628968448/STEM/1c93968b41b14eb092aecf1c08ad491a.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2014/4/21/1571634623266816/1571634628968448/STEM/f05cff5034bb4bc5b0c6296312c8925f.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2014/4/21/1571634623266816/1571634628968448/STEM/7926af17c7254dd1b717ccda7ced5f31.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2014/4/21/1571634623266816/1571634628968448/STEM/1c93968b41b14eb092aecf1c08ad491a.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2014/4/21/1571634623266816/1571634628968448/STEM/1c93968b41b14eb092aecf1c08ad491a.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2014/4/21/1571634623266816/1571634628968448/STEM/bd96b51f9d4b4e54a44de6d907bc796e.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2014/4/21/1571634623266816/1571634628968448/STEM/f1cb61b13f11474b8ac9b2dcd62dcc25.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2014/4/21/1571634623266816/1571634628968448/STEM/4440292c3d6c42249529d95b2338a56e.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2014/4/21/1571634623266816/1571634628968448/STEM/1c93968b41b14eb092aecf1c08ad491a.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2014/4/21/1571634623266816/1571634628968448/STEM/cf31fc268e334188af220993f5a147d0.png?resizew=47)
![](https://img.xkw.com/dksih/QBM/2014/4/21/1571634623266816/1571634628968448/STEM/26aa5cccab58497baf6d017b3a5498ab.png?resizew=109)
![](https://img.xkw.com/dksih/QBM/2014/4/21/1571634412396544/1571634417868800/STEM/4e48942e-4f0d-49af-99c6-ca1b5379ef7e.png?resizew=285)
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