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已知圆柱的底面半径为2cm,高为5cm,则圆柱的侧面积是 ( )A.20 cm2 8.20兀cm2 C.10兀cm2 D.5兀cm2
已知圆柱的底面半径为2cm,高为5cm,则圆柱的侧面积是 ( )
A.20 cm2 8.20兀cm2 C.10兀cm2 D.5兀cm2