求出下列图形中阴影部分的面积。（每个小方格的边长表示1cm）:V'L9X7t,j
:V'L9X7t,j
1h8s9|(x5v7G9B4Z5U/G8K0[7Ycm2:V'L9X7t,j
3r,W:q-@+P'v2}6u(f4d5A/hcm2:V'L9X7t,j
(a1k6P,H/F'c5K+W5j,y;g3L1r;N*mcm2:V'L9X7t,j
:V'L9X7t,j
:V'L9X7t,j
:V'L9X7t,j