Examples
        ========

        >>> from sympy import Point, Triangle
        >>> p1, p2, p3 = Point(0, 0), Point(1, 0), Point(0, 1)
        >>> t = Triangle(p1, p2, p3)
        >>> t.medial
        Triangle(Point2D(1/2, 0), Point2D(1/2, 1/2), Point2D(0, 1/2))

        r