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(2011•西藏)如图,AB是⊙O的弦,OC⊥AB于点C,若AB=8cm,OC=...
(2011•西藏)如图,AB是⊙O的弦,OC⊥AB于点C,若AB=8cm,OC=3cm,则⊙O的半径为
cm.
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