单选题 较易0.85 引用4 组卷396
如图,已知⊙O的半径为5cm,弦AB=6cm,则圆心O到弦AB的距离是( )
![](https://img.xkw.com/dksih/QBM/2017/11/27/1826221759643648/1827897655099392/STEM/abc93433b92a46998f2aaf080982c92a.png?resizew=80)
![](https://img.xkw.com/dksih/QBM/2017/11/27/1826221759643648/1827897655099392/STEM/abc93433b92a46998f2aaf080982c92a.png?resizew=80)
A.1cm | B.2cm | C.3cm | D.4cm |
15-16九年级上·浙江宁波·阶段练习
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如图,OA是半⊙O的半径,弦BC⊥OA于点E,连接OC,若⊙O的半径为m,∠AOC=∠α,则下列结论一定成立的是( )
![](https://img.xkw.com/dksih/QBM/2022/2/2/2907649228587008/3025294836785152/STEM/e098df9bbd71479e8992ba0a03fc3ed6.png?resizew=131)
![](https://img.xkw.com/dksih/QBM/2022/2/2/2907649228587008/3025294836785152/STEM/e098df9bbd71479e8992ba0a03fc3ed6.png?resizew=131)
A.OE=m•tanα | B.BC=2m•sinα |
C.AE=m•cosα | D.S△COB= |
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