求如图中阴影部分的面积，已知圆的半径为4厘米。1d(Y8m9n+A:~.s
1d(Y8m9n+A:~.s
算式：提示-u8j4m:{(}1f-U,D1d(Y8m9n+A:~.s
答：阴影部分的面积是9z7n)X3a3\3R平方厘米。1d(Y8m9n+A:~.s