#Welcome screen:
def welcome():
    print "Welcome to the Area Calculation Program."
    print
welcome()

#Shape choice:
def shape():
    print "Choose a Shape:"
    print "1 Circle"
    print "2 Square"
    print "3 Triangle"
    print "4 Exit"
    print
shape()

#shape choice:
def choice():
    shape=raw_input(">")
    if shape in["1","circle"]:
        print "1 Radius"
        print "2 Diameter"
        print "3 Circumference"
        print "4 Area"
        print
    if shape in["2","square"]:
        print "Sorry, Square is not complete yet."
        print
        shape()
        choice()
    if shape in["3","triangle"]:
        print "Sorry, Triangle is not complete yet."
        print
        shape()
        choice()
    if shape in["4","exit"]:
        print "goodbye"
        goodbye()
        
        
choice()


#If radius:
def radius():
    radius=int(raw_input("Enter Radius:"))
    diameter=(radius*2)
    circumference=(diameter*3.14)
    area=(radius**2*3.14)
    print "Diameter",diameter
    print "Circumference",circumference
    print "Area",area
    print
    print

#If diameter:
def diameter():
    diameter=int(raw_input("Enter Diameter:"))
    radius=(diameter/2)
    circumference=(diameter*3.14)
    area=(radius**2*3.14)
    print "Radius",radius
    print "Circumference",circumference
    print "Area",area
    print
    print

#If Circumference:
def circumference():
    circumference=int(raw_input("Enter Circumference:"))
    radius=(circumference/3.14/2)
    diameter=(radius*2)
    area=(radius**2*3.14)
    print "Radius",radius
    print "Diameter",diameter
    print "Area",area
    print
    print

#If Area:
def area():
    area=int(raw_input("Enter Area:"))
    radius=(sqrt(area/3.14))
    diameter=(radius*2)
    circumference=(diameter*2)
    print "Radius",radius
    print "Diameter",diamter
    print "Circumference",circumference
    print
    print




def choice0():
    given=raw_input(">")
    if given in["1","radius"]:
        radius()
    if given in["2","diameter"]:
        diameter()
    if given in["3","circumference"]:
        circumference()
    if given in["4","area"]:
        area()
choice0()

shape()
choice0()









#Exit_end
def goodbye():
   eof