1 . 选修4-1:几何证明选讲
如图,已知
是圆
的直径,直线
与圆
相切于点
,弦
的延长线交
于点
,若
.
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/b713a6ec72c844b8b6a3c8b717ed886a.png)
(1)求证:
;
(2)若
,求
的长.
如图,已知
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/042fd3ef9f594f32a83fdd68d7551d26.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/65ef5b05f2c9405fa299a0171bb54946.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/f7295fa847044b3491efc4855658bcbc.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/65ef5b05f2c9405fa299a0171bb54946.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/8d7ea70146f9455cb69b3b2a027eb17b.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/a21a70b48b4d4667882c4f75bfbb925b.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/f7295fa847044b3491efc4855658bcbc.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/768533cc87644e0a8051f67ccee2cae8.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/a687acef66324117b22f723b21e5711d.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/b713a6ec72c844b8b6a3c8b717ed886a.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/851972b7f1264771b091df44f9b3d5be.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/e28b89ab27f6440a82f71840c417244d.png)
![](https://img.xkw.com/dksih/QBM/2016/11/9/1573134191722496/1573134197751808/STEM/87c70674ae4a405a96994c63081fa409.png)
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2016-12-05更新
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2卷引用:2017届云南曲靖一中高三上月考二数学(理)试卷