英语翻译ABCD is a square with BC=12cm.⌒BOC and ⌒DOC are se

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英语翻译
ABCD is a square with BC=12cm.⌒BOC and ⌒DOC are semicircles.In terms of π（pi,圆周率）,what is the area of the shaded region?( )
A.18π-36 B.72 π-144

C.144-36π D.36-9π

题目：正方形ABCD边长BC=12cm,BOC和COD分别是两个半圆,求两个半圆重叠部分（阴影）的面积,用π表示
连接CO,把阴影部分一分为二,先求出上半部分,然后再乘以2即可.
过O做一条垂线交BC与E,上半部分阴影就是1/4圆 - 三角形COE的面积,即9π-18
所以答案是A

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