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(2005•宁夏)如果圆锥的母线长为6cm,底面圆半径为3cm,则这个圆锥的侧面...
(2005•宁夏)如果圆锥的母线长为6cm,底面圆半径为3cm,则这个圆锥的侧面积为( )
A.9πcm2
B.18πcm2
C.27πcm2
D.36πcm2
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