如图,四边形ACBD内接于圆O,对角线AC与BD相交于M, AC⊥BD,E是DC中点连结EM交AB于F,作OH⊥AB于H,
![](https://img.xkw.com/dksih/QBM/2013/3/13/1571141331828736/1571141337530368/STEM/576c85655cb1406cb3fca211e3aecaad.png)
求证:(1)EF⊥AB (2)OH=ME
![](https://img.xkw.com/dksih/QBM/2013/3/13/1571141331828736/1571141337530368/STEM/576c85655cb1406cb3fca211e3aecaad.png)
求证:(1)EF⊥AB (2)OH=ME
2013·甘肃·一模 查看更多[2]
更新时间:2016-12-02 04:38:08
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【推荐1】如图,AB和BC分别与圆O相切于点D,C,AC经过圆心O,且BC=2OC.求证:AC=2AD.
![](https://img.xkw.com/dksih/QBM/2014/3/24/1571574124314624/1571574129573888/STEM/957986a1cdda4c889dba70b29d7e51aa.png)
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【推荐2】如图所示,AB为⊙O的直径,BC、CD为⊙O的切线,B、D为切点,
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572803562536960/1572803569025024/STEM/50029f0b7769496aa233ed4b6f57e0c0.png)
(1)求证:AD
OC;
(2)若⊙O的半径为
,求AD
OC的值.
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572803562536960/1572803569025024/STEM/50029f0b7769496aa233ed4b6f57e0c0.png)
(1)求证:AD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
(2)若⊙O的半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b18d78c40ce368f60208949c5ae3fb.png)
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