如图,PA、PB是⊙O的两条切线,切点分别是A、B,连结AB,若直径AC=10,∠P=60°,求弦AB的长.
![](https://img.xkw.com/dksih/QBM/2019/1/9/2115058874818560/2115965385195521/STEM/20100ab950da4e25af2233c5e97f6790.png?resizew=84)
17-18九年级下·全国·单元测试 查看更多[1]
(已下线)第27章 综合能力测试卷-2018年九年级下册数学(华师大版)
更新时间:2019-01-10 22:45:30
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【推荐1】如图,在Rt△ABC中,∠C=90°,⊙O是Rt△ABC的内切圆,切点为D、E、F.
(1)求证:四边形OECF是正方形;
(2)若AF=10,BE=3,求⊙O的面积.
(1)求证:四边形OECF是正方形;
(2)若AF=10,BE=3,求⊙O的面积.
![](https://img.xkw.com/dksih/QBM/2019/6/13/2224795158216704/2228255340126208/STEM/8a6107ea21274deeae9e1d6cd5caba8c.png?resizew=173)
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解答题-证明题
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适中
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【推荐2】如图,半圆O的直径是AB,AD、BC是两条切线,切点分别为A、B,CO平分
.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894157960167424/2933994675904512/STEM/cf891eca-dd0f-4430-b741-6a23df1c31f7.png?resizew=159)
(1)求证:CD是半圈O的切线.
(2)若
,
,求BC和AB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894157960167424/2933994675904512/STEM/cf891eca-dd0f-4430-b741-6a23df1c31f7.png?resizew=159)
(1)求证:CD是半圈O的切线.
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b03bb56c7e76954b192bd8595a0865a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2beaf3846ecd4d1c6f9b4cf065cff09c.png)
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