Below is the program which calculates the areas of Rectangle, Circle, and Square. It takes the inputs from user such as length and width for Rectangle, radius for Circle, and side of Square for Square. Code: length = int ( input ( "Enter the length of the Rectangle " )) width = int ( input ( "Enter the width of the Rectangle " )) radius = int ( input ( "Enter radius of Circle " )) side = int ( input ( "Enter side of the Square " )) class Area : def __init__ ( self , length, width, radius, side,): self . length = length self . width = width self . radius = radius self . side = side def Rect_area ( self ): rect_area = self . length * self . width p...