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如图一把打开的雨伞可近似的看成一个圆锥,伞骨(面料下方能够把面料撑起来的支架)末...
如图一把打开的雨伞可近似的看成一个圆锥,伞骨(面料下方能够把面料撑起来的支架)末端各点所在圆的直径AC长为12分米,伞骨AB长为9分米,那么制作这样的一把雨伞至少需要绸布面料为( )平方分米.
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A.36π
B.54π
C.27π
D.128π
考点分析:
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