题解 | #圆的面积#
圆的面积
https://www.nowcoder.com/practice/a235f884c28e46c491e7ddc414b54d2b
import math r = float(input()) S = math.pi * r**2 print('%.3f'%S)
圆的面积
https://www.nowcoder.com/practice/a235f884c28e46c491e7ddc414b54d2b
import math r = float(input()) S = math.pi * r**2 print('%.3f'%S)
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