Python Animal Pens | Python Fiddle

#OBJECTIVE: THIS PROGRAM DISPLAYS MY UNDERSTANDING OF FUNCTIONS 
#THROUGH DEVOLOPMENT OF A PROGRAM CALLED ANIMAL PENS
            #CREATED BY: HILL, DARNELL
            #DATE: FEBURARY 11, 2014
            #COURSE: CIS 229 PYHTON
#GLOBAL VARIABLES:
global area 
global perimenter

import math
def main():
	print'''WELCOME TO ANIMAL PENS\nLETS GET STARTED\n'''
	getCow()
	getRhino() 
	getTurtle()   
	getBird()
	print("\nTHE TOTAL AREA IS: %.3f\nTHE TOTAL PERIMENTER IS: %.3f") % (area, perimenter)

def getCow():
	cowLength = input("ENTER THE COW'S LENGTH: ")
	cowHeight = input("\nENTER THE COW'S HEIGHT: ")
	cowArea = cowLength * cowHeight
	cowPerimenter = (2 * cowLength) + (2 * cowHeight)
	global area    
	area = cowArea
	global perimenter    
	perimenter = cowPerimenter     
	print("\nTHE AREA FOR THE COW: %d\nTHE PERIMENTER FOR THE COW: %d") % (cowArea, cowPerimenter)
	return

def getRhino():
	rhinoLength = input("\nENTER THE RHINO'S LENGTH: ")
	rhinoHeight = input("\nENTER THE RHINO'S HEIGHT: ")
	rhinoArea = rhinoLength * rhinoHeight
	rhinoPerimenter = (2 * rhinoLength) + (2 * rhinoHeight)
	global area
	area = area + rhinoArea
	global perimenter
	perimenter = perimenter + rhinoPerimenter     
	print("\nTHE AREA FOR THE RHINO: %d\nTHE PERIMENTER FOR THE RHINO: %d") % (rhinoArea, rhinoPerimenter)
	return

def getTurtle():
	turtleLength = input("\nENTER THE TURTLE'S LENGTH: ")
	turtleHeight = input("\nENTER THE TURTLE'S HEIGHT: ")
	turtleArea = turtleLength * turtleHeight
	turtlePerimenter = (turtleLength * 2) + (turtleHeight * 2)
	global area
	area =  area + turtleArea
	global perimenter
	perimenter = perimenter + turtlePerimenter    
	print("\nTHE AREA FOR THE TURTLE: %d\nTHE PERIMENTER FOR THE TURTLE: %d") % (turtleArea, turtlePerimenter)
	return
def getBird():
	birdLenght = input("\nENTER THE BIRD'S LENGTH: ")
	birdHeight = input("\nENTER THE BIRD'S HEIGHT: ")
	birdRadius = input("\nENTER THE BIRD'S RADIUS: ")
	birdPerimenter = 2 * math.pi * birdRadius
	birdArea = (math.pi) * (birdRadius ** 2)  
	global area
	area = area + birdArea
	global perimenter
	perimenter = perimenter + birdPerimenter    
	print("\nTHE AREA FOR THE BIRD: %.2f\nTHE PERIMENTER FOR THE BIRD: %.2f") % (birdArea, birdPerimenter)
	return
main()

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