Area of different figures

"""
This program will give you the area of any geometric shape
"""

import math

def area_circle():
    r = float(raw_input("Enter the radius of the circle: "))
    area = math.pi * (r ** 2)
    return area

def area_parallelogram():
    l = float(raw_input("Enter the length of the figure: "))
    w = float(raw_input("Enter the width of the figure: "))
    area = l * w
    units = "square " + str(raw_input("Enter the units: "))
    return str(area) + " " + units

def area_triangle():
    b = float(raw_input("Enter the base of the figure: "))
    h = float(raw_input("Enter the height of the figure: "))
    area = (b*h)/2
    units = "square " + str(raw_input("Enter the units: "))
    return str(area) + " " + units

def area_polygon():
    n = int(raw_input("Enter the number of sides the figure has: "))
    if n <= 2:
        return "This is not a valid figure."
    elif n <= 4:
        return "Use another function."
    else:
        a = float(raw_input("Enter the apothem of the figure: "))
        int_angle = 360/n
        if int_angle/2 == 30 or int_angle/2 == 60:
	        oneside = 2 * (a / (math.sqrt(3)))
            P = oneside * n
            area = (P * a) / 2
            return area
area_polygon()

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