SOE ex.2.1
rectangle :: Side -> Side -> Shape
rectangle width height = Polygon [(0, 0), (width, 0), (width, height), (0, height)]
rtTriangle :: Side -> Side -> Shape
rtTriangle width height = Polygon [(0, 0), (width, 0), (0, height)]
rectangle :: Side -> Side -> Shape
rectangle width height = Polygon [(0, 0), (width, 0), (width, height), (0, height)]
rtTriangle :: Side -> Side -> Shape
rtTriangle width height = Polygon [(0, 0), (width, 0), (0, height)]