radius = 3
PI = 3.14
area = PI * radius * radius
print("Area = %.2f" % area)
diameter = 2 * radius
print("Diameter = %.2f" % diameter)
circumference = 2 * PI * radius
print("Circumference = %.2f" % circumference)
'''
run:
Area = 28.26
Diameter = 6.00
Circumference = 18.84
'''