A = (2, 5)
B = (2, 1)
a = Line(A, B)
C = Point(a)
D = (1, 4)
E = Point(a)
F = (1, -1)
G = (-2, 4)
Vieleck1, d, c, e, f, g = Polygon(D, C, E, F, G)
D' = Mirror(D, a)
C' = Mirror(C, a)
E' = Mirror(E, a)
F' = Mirror(F, a)
G' = Mirror(G, a)
Vieleck1', d', c', e', f', g' = Polygon(D', C', E', F', G')