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