求下列图形阴影部分的周长。5q+W:W5H2t2s0{
5q+W:W5H2t2s0{
算式：提示(m8m3w6x5q+W:W5H2t2s0{
答：阴影部分的周长*p5Q+t-j({8p*e厘米。5q+W:W5H2t2s0{