题目:
劳技课上,王芳制作了一个圆锥形纸帽,已知纸帽底面圆直径为20cm,母线长为40cm.则将这个纸帽展开图的面积等于 [ ]
A. 300πcm
B.400πcm
C.600πcm
D.800πcm
答案:
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