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如图,AB是⊙O的直径,点D在AB的延长线上,DC切⊙O于点C,若∠A=25°,...
如图,AB是⊙O的直径,点D在AB的延长线上,DC切⊙O于点C,若∠A=25°,则∠D等于( )
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A.20°
B.30°
C.40°
D.50°
考点分析:
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