给定一个数为r,求从1到r的所有圆的面积,每个圆的面积占一行,保留两位小数(如r=3,就是输出半径为1,半径为2,半径为3的圆的面积)
(本题定义圆周率 Π = 3.14)
3
3.14
12.56
28.26
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