# sphere.py
# YOUR NAME(S), DATE












# solution must be above this comment

# do not change any part of the code below
def main():
    radius = float( input("enter radius: ") )
    print("circumference: {0:.1f}".format(circumference(radius)))
    print("circle area: {0:.1f}".format(area(radius)))
    print("sphere volume: {0:.1f}".format(volume(radius)))
    print("sphere surface area: {0:.1f}".format(surface(radius)))

main()