求下列图形阴影部分的周长。答：

求下列图形阴影部分的周长。1o'J,j7`:h'k7L7F9`/z1N+B5y7^3T3F7T5a1Y

1o'J,j7`:h'k7L7F9`/z1N+B5y7^3T3F7T5a1Y

算式：提示*}7{(Q0Q8^5U'X+E:A1o'J,j7`:h'k7L7F9`/z1N+B5y7^3T3F7T5a1Y

答：阴影部分的周长8s*`0d4Z9R)U*i+~6u-e2n3{(d厘米。1o'J,j7`:h'k7L7F9`/z1N+B5y7^3T3F7T5a1Y