如图,已知AB是☉O的直径,DC是☉O的切线,点C是切点,AD⊥DC,垂足为D,且与圆O相交于点E.
(1)求证:∠DAC=∠BAC.
(2)若☉O的直径为5cm,EC=3cm,求AC的长.
(1)求证:∠DAC=∠BAC.
(2)若☉O的直径为5cm,EC=3cm,求AC的长.
![](https://img.xkw.com/dksih/QBM/2018/12/11/2094578701672448/2099909063802880/STEM/0246253cd17245d1affecaa7f48cc831.png?resizew=123)
更新时间:2018-12-19 06:18:50
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【推荐2】如图,
是
的直径,
切
于点
,
交
于点
,连结
.已知
的半径为2,
.
![](https://img.xkw.com/dksih/QBM/2019/12/30/2366147481657344/2367618932236288/STEM/fe83db211fe14d44997cb55905aeefc6.png?resizew=230)
(1)求
的度数;
(2)求
的长.(结果保留
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70fa5ee650974c2b4bf8d98ad593e2fc.png)
![](https://img.xkw.com/dksih/QBM/2019/12/30/2366147481657344/2367618932236288/STEM/fe83db211fe14d44997cb55905aeefc6.png?resizew=230)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
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