题目8多选题
输入一个表示半径的浮点数,计算圆的面积的程序正确的有: (圆周率取使用math库中的pi值,结果保留2位小数)A. import math radius = float(input()) area = math.pi * radius ** 2 print(round(area, 2))B. import math radius = float(input()) area = pi * radius ** 2 print(round(area, 2))C. from math import pi radius = float(input()) area = math.pi * radius ** 2 print(round(area, 2))D. from math import pi radius = float(input()) area = pi * radius ** 2 print(round(area, 2))