求出阴影部分的面积？
\u6c42\u51fa\u9634\u5f71\u90e8\u5206\u9762\u79efS\u957f\u65b9\u5f62=4*2=8
S\u534a\u5706=1/2*\u03c0*(d/2)²=2\u03c0
\u2234S\u9634\u5f71=S\u957f\u65b9\u5f62-S\u534a\u5706=8-2\u03c0\u22481.72
AD=1
BE=BA+AE=BA+AD=1+1=2
CF=CB+BF=CB+BE=1+2=3
DG=DC+CG=DC+CF=1+3=4
\u9634\u5f71\u90e8\u5206\u7684\u9762\u79ef=\u03c0*AD^2/4+\u03c0*BE^2/4+\u03c0*CF^2/4+\u03c0*DG^2/4
=(1*1+2*2+3*3+4*4)\u03c0/4
=15\u03c0/2
=23.55 \u5e73\u65b9\u5398\u7c73
\u9634\u5f71\u90e8\u5206\u7684\u9762\u79ef=\u4e09\u89d2\u5f62\u9762\u79ef+\u534a\u5706\u9762\u79ef(\u76f4\u5f8412cm)+\u534a\u5706\u9762\u79ef(\u76f4\u5f8416cm)-\u534a\u5706\u9762\u79ef(\u76f4\u5f8420cm)
\u9634\u5f71\u90e8\u5206\u7684\u9762\u79ef=12*16/2+\u03c0*12*12/8+\u03c0*16*16/8-\u03c0*20*20/8=96 \u5e73\u65b9\u5398\u7c73
S阴影=9×4-π×2×2
=36-4π
=36-12.56
=23.44
4×9-π4=36-4π
面积23.44
9*4-π*2^2
4×9-派2.25方
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