# For a challenge, find a built-in way to use pi :) PI = 3.1359 # This is a function. It takes a value and returns a value def areaOfCircle( radius ): area = PI * radius ** 2 return area # Ask user for radius, cast it from text to float rad = float(raw_input("Input radius: ")) # Radius is now a float value stored in variable rad print "Radius is now", rad # Call function, pass function radius, store answer in variable area area = areaOfCircle(rad) #You can now use the area for whatever print "Area of circle is: ", area
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