# Problem 04
# use the command import math
# print the header that says "Area of a Circle"
# skip 2 blank lines
# Ask the user to input the radius of a circle
# and store the result in a variable called radius.
# Be sure to convert what the user enters into a float.
# Always use descriptive names for your variables.
# skip a blank line
# Tell the computer to compute the area of the circle.
# Store your answer in a variable called area
# Use math.pi for pi. At the top of your program import math
# print out "The area of the circle is " + area + " square units."
# You will need to convert the area to String str(area)
# You can't join a String and an int together
# You can only join a String to another String
# skip 2 blank lines