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小强要制作一个圆锥形模型,其侧面是由一个半径为18cm,圆心角为200°的扇形纸...
小强要制作一个圆锥形模型,其侧面是由一个半径为18cm,圆心角为200°的扇形纸板制成的,还需用一块圆形纸板做底面,那么这块圆形纸板的直径为( )
A.25cm
B.20cm
C.15cm
D.10cm
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