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(2001•沈阳)在半径为6cm的圆中,长为2πcm的弧所对的圆周角的度数是( ...
(2001•沈阳)在半径为6cm的圆中,长为2πcm的弧所对的圆周角的度数是( )
A.30°
B.45°
C.60°
D.90°
考点分析:
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