class Forme:
    def __init__(self, org):
        self.origine = org

    def perimetre(self):
        raise NotImplementedError


class Polygone(Forme):
    def __init__(self, org, pts):
        self.origine = org
        self.sommets = pts

    def perimetre(self):
        perim = 0
        for i in range(0, len(self.sommets) - 1):
            p1 = self.sommets[i]
            p2 = self.sommets[i+1]
            perim += Vec2D.norme(p1 - p2)
        return perim

class Rectangle(Polygone):
    def __init__(self, mil, larg, haut):
        super().__init__(self, mil)
        self.origine = mil
        self.larg = larg
        self.haut = haut
        self.pts = [Vec2D(mil.x + larg/2, mil.y + haut/2), Vec2D(mil.x - larg/2, mil.y + haut/2), Vec2D(mil.x + larg/2, mil.y - haut/2), Vec2D(mil.x - larg/2, mil.y - haut/2)]