如图,AC是⊙O的直径,弦BD⊥AC于点E,连接BC过点O作OF⊥BC于点F,若BD=12cm,AE=4cm,则OF的长度是( )
![](https://img.xkw.com/dksih/QBM/2019/10/11/2309759964094464/2311895705542656/STEM/ba59a8fb82af4f49ad5088a3f9655ebd.png?resizew=151)
![](https://img.xkw.com/dksih/QBM/2019/10/11/2309759964094464/2311895705542656/STEM/ba59a8fb82af4f49ad5088a3f9655ebd.png?resizew=151)
A.![]() | B.![]() | C.![]() | D.3cm |
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更新时间:2019-10-14 18:26:45
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【推荐1】如图,已知正方形
的边长为12,
,将正方形的边
沿
折叠到
,延长
交
于G,连接
.现有如下3个结论:①
;②
;③
的长为4.其中正确的个数为( )
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A.0 | B.1 | C.2 | D.3 |
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【推荐2】如图,
是
的外接圆,弦
交
于点E,
,
,过点O作
于点F,延长
交
于点G,若
,
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的长为( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.![]() | B.7 | C.8 | D.![]() |
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【推荐1】如图,已知AB、AC分别为⊙O的直径和弦,D为
的中点,DE垂直于AC的延长线于E,连结BC,若DE=6cm, CE=2cm,下列结论:①. DE是⊙O的切线;②. 直径AB长为20cm;③. 弦AC长为15cm;④. C为
的中点.一定正确的个数是( )
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【推荐2】如图,⊙O的直径CD=10,弦AB⊥CD,垂足为M,CM=2,则AB的长为( )
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