# Simple function examples

def rectanglePerimeter(rLength,rWidth):
    '''
    rLength: length of the rectangle.

    rWidth: width of the rectangle.

    Returns the perimeter of the rectangle.'''
    perimeter = 2 * (rLength + rWidth)
    return(perimeter)

def rectangleArea(rLength,rWidth):
    area = rLength * rWidth
    return(area)

def squarePerimeter(rLength):
    perimeter = rectanglePerimeter(rLength,rLength)
    return(perimeter)

def  squareArea(rLength):
    area = rectangleArea(rLength,rLength)
    return(area)

# ======================== Main Program =============================

length = 2.
width = 3.

retValue = rectanglePerimeter(length,width)
print(retValue)

retValue = rectangleArea(length,width)
print(retValue)

retValue = squarePerimeter(length)
print(retValue)

retValue = squareArea(length)
print(retValue)