# Task 2 Solution
_PI = 3.14
radius = int(input("Please enter the radius:"))
area = _PI * radius**2
print("The area of a circle is:" + str(area))

# Task 3 Solution
circumference = 2 * _PI * radius
diameter = 2 * radius
print("The diameter of a circle is:" + str(diameter))
print("The circumference of a circle is:" + str(circumference))
