题解 | 球的表面积
球的表面积
https://www.nowcoder.com/practice/7a5e2f1ed2594e38bad804323a775c93
from math import pi as p
class ball(object):
def __init__(self,r):
self.r =r
self.size = 4*p*self.r**2
arr = [1,2,4,9,10,13]
arr1 = []
for i in arr:
a = ball(i)
arr1.append(a)
for j in arr1:
print('%.2f'%(j.size))
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