Invariant Parallelogram
Author: JCA

A = (-2.191999999999997, 5.945999999999999)
B = (6.168000000000003, 3.063999999999999)
C = (8.412000000000003, -1.7760000000000002)
D = (-6.481999999999997, -2.2380000000000004)
poly1, a, b, c, d = Polygon(A, B, C, D)
E = Midpoint(A, B)
F = Midpoint(B, C)
G = Midpoint(C, D)
H = Midpoint(D, A)
poly2, h, e, f, g = Polygon(H, E, F, G)
u = Vector(H, E)
v = Vector(F, E)
G' = Translate(G, v)
w = Vector(G, G')
G'_1 = Translate(G, u)
z = Vector(G, G'_1)
i = Segment(D, B)
j = Segment(A, C)