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如图,已知⊙O的半径OA的长为5,弦AB的长为8,半径OD过AB的中点C,则CD...
如图,已知⊙O的半径OA的长为5,弦AB的长为8,半径OD过AB的中点C,则CD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001040142865822/SYS201311030010401428658004_ST/images0.png)
A.2
B.3
C.4
D.5
考点分析:
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001040142726654/SYS201311030010401427266027_ST/0.png)
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