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(2008•濮阳)如图所示,AB为⊙O的直径,AC为弦,OD∥BC交AC于点D,...
(2008•濮阳)如图所示,AB为⊙O的直径,AC为弦,OD∥BC交AC于点D,若AB=20cm,∠A=30°,则AD=
cm.
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