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(2009•嘉兴)如图,⊙P内含于⊙O,⊙O的弦AB切⊙P于点C,且AB∥OP,...
(2009•嘉兴)如图,⊙P内含于⊙O,⊙O的弦AB切⊙P于点C,且AB∥OP,若阴影部分的面积为9π,则弦AB的长为( )
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A.3
B.4
C.6
D.9
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