如图,圆
的直径
,直线
和圆
相切于点
,
于
,若
,则
的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b92bdf778aa32f238bad820d72d62f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573019552628736/1573019558780928/STEM/7f64961f-e53f-4843-b77a-ae6def2cb8d3.png)
更新时间:2016-12-04 20:19:23
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【知识点】 几何证明选讲
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真题
【推荐1】(考生注意:请在下列三题中任选一题作答,如果多做,则按所做的第一题给分)
![](https://img.xkw.com/dksih/QBM/2010/6/25/1569771375550464/1569771380498432/STEM/ef47e5c9f51f4331b4db1b980dd75d3f.png?resizew=190)
A.(不等式选做题)不等式
的解集为
B. (几何证明选做题) 如图,已知Rt△ABC的两条直角边AC、BC的长分别为3cm、4cm,以AC为直径的圆与AB交于点D,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8343a6f1c7eca9869bc7d2c3b1f4404a.png)
C, (坐标系与参数方程选做题)已知圆C的参数方程为
(a为参数)以原点为极点,x轴正半轴为极轴建立极坐标系,直线l的极坐标方程为
,则直线l与圆C的交点的直角坐标系为____
![](https://img.xkw.com/dksih/QBM/2010/6/25/1569771375550464/1569771380498432/STEM/ef47e5c9f51f4331b4db1b980dd75d3f.png?resizew=190)
A.(不等式选做题)不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a4187a7c3b77623b5152a5785f79670.png)
B. (几何证明选做题) 如图,已知Rt△ABC的两条直角边AC、BC的长分别为3cm、4cm,以AC为直径的圆与AB交于点D,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8343a6f1c7eca9869bc7d2c3b1f4404a.png)
C, (坐标系与参数方程选做题)已知圆C的参数方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920a74c5559812b3d6ac0bf7cb67384d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/174e096282d38a2482244880356711da.png)
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【推荐2】如图,
为⊙
的直径,
,弦
交
于点
.若
,
,则
的长为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/2013/5/7/1571206228746240/1571206234243072/STEM/868fb60286e548f68b3d2a8c4ede842a.png?resizew=125)
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