怎样续写才能使这个代码运行？

Question

Answer 1

import math


class Circle:
    def __init__(self, radius=1):
        self.radius = radius

    def getPerimeter(self):
        return 2 * self.radius * math.pi

    def getArea(self):
        return self.radius * self.radius * math.pi

    def setRadius(self, radius):
        self.radius = radius

if __name__ == '__main__':
    r = eval(input('输入圆的半径：'))
    circle = Circle(r)
    print('周长：%.2f' % (circle.getPerimeter()))
    print('面积：%.2f' % (circle.getArea()))