Sample Solution

The following shows one way to solve this problem. It is not the only way this can be solved.

teach13_sample.py

"""
File: teach13_sample.py
Author: Brother Burton

Purpose: Use functions to calculate areas.
"""

import math

def compute_area_square(side):
    return side * side

def compute_area_rectangle(length, width):
    return length * width

def compute_area_circle(radius):
    return math.pi * radius * radius


# The main program starts here...
shape = ""

while shape != "quit":
    shape = input("What shape do you have? ")

    # Convert it to lower case once, so we don't have to keep converting it
    shape = shape.lower()

    if shape == "square":
        side = float(input("What is the length of the side? "))
        area = compute_area_square(side)
        print(f"The area is {area}")
    elif shape == "rectangle":
        length = float(input("What is the length? "))
        width = float(input("What is the width? "))
        area = compute_area_rectangle(length, width)
        print(f"The area is {area}")
    elif shape == "circle":
        radius = float(input("What is the radius? "))
        area = compute_area_circle(radius)
        print(f"The area is {area}")