@classmethod

class MathUtils:
    PI = 3.14159

    @classmethod
    def circle_area(cls, radius):
        return cls.PI * radius**2

    @classmethod
    def circle_circumference(cls, radius):
        return 2 * cls.PI * radius

print(MathUtils.circle_area(5))  # Output: 78.53975
print(MathUtils.circle_circumference(5))  # Output: 31.4159

math_obj = MathUtils()
print(math_obj.circle_area(3))  # Output: 28.27431
print(math_obj.circle_circumference(3))  # Output: 18.84954