求阴影部分的面积。（单位：米）.x6y:r4u7M;n1R6z(m+P.S0^*|.f.H+d
.x6y:r4u7M;n1R6z(m+P.S0^*|.f.H+d
算式：提示0e;}6C6V5B;M.x6y:r4u7M;n1R6z(m+P.S0^*|.f.H+d
答：阴影部分的面积*]2B(B.n:m平方米。.x6y:r4u7M;n1R6z(m+P.S0^*|.f.H+d