求阴影面积,
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求阴影面积,
求阴影面积,
求阴影面积,
阴影面积=4*4-π*(4/2)^2/4-(4/2)*(4/2)/2+(π*(4/2)^2/4-(4/2)*(4/2)/2)
=4*4-π*(4/2)^2/4-(4/2)*(4/2)/2+π*(4/2)^2/4-(4/2)*(4/2)/2)
=4*4-(4/2)*(4/2)/2-(4/2)*(4/2)/2)
=4*4-(4/2)*(4/2)
=12平方厘米