1 . 选修4-1:几何证明选讲
如图所示,
为圆
的直径,
,
为圆
的切线,
,
为切点.
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097900642304/1572097906450432/STEM/651ae81841e14226911eac4218070a32.png)
(1)求证:
;
(2)若圆
的半径为2,求
的值.
如图所示,
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097900642304/1572097906450432/STEM/841b4ff174f1434cbc4b01f93685864e.png)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097900642304/1572097906450432/STEM/880a051115ac40cf8fdbd39430aefdb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097900642304/1572097906450432/STEM/86332524a2e740718c74cd0d4d53e623.png)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097900642304/1572097906450432/STEM/880a051115ac40cf8fdbd39430aefdb4.png)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097900642304/1572097906450432/STEM/71e35b4d73d64ccfb0224841738db340.png)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097900642304/1572097906450432/STEM/880f4116ec9946aaa1e13f0904238988.png)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097900642304/1572097906450432/STEM/651ae81841e14226911eac4218070a32.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097900642304/1572097906450432/STEM/3434b93dbb364b1989dba94b80f99234.png)
(2)若圆
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097900642304/1572097906450432/STEM/880a051115ac40cf8fdbd39430aefdb4.png)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097900642304/1572097906450432/STEM/e0c3c0f9c5d54354a1847cc040bc14c0.png)
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5卷引用:2016届青海西宁五中四中十四中高三下学期联考数学(理)试卷
2013·青海西宁·一模
2 . 如图,正方形
的边长为
,延长
至
,使
,连接
、
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e0b195cb4e229fdd901f6d69f40688.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e0b195cb4e229fdd901f6d69f40688.png)
![](https://img.xkw.com/dksih/QBM/2014/9/12/1571852442075136/1571852447907840/STEM/e11f627447804b5aa653e93c74266cc0.png?resizew=136)
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6卷引用:2013届青海省西宁五中片区高三大联考文科数学试卷
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