A

B

C

A = (-3, 3)
B = (-3, 6)
C = (3, 6)
E = (6, 0)
F = (6, -3)
G = (0, -3)
H = (-3, -3)
D = (6, 6)
poly1, c, a, b = Polygon(A, B, C)
poly2, e, c_1, d = Polygon(C, D, E)
poly3, g, e_1, f = Polygon(E, F, G)
poly4, h, g_1, a_1 = Polygon(G, A, H)
α = Angle(A, B, C)
β = Angle(G, H, A)
γ = Angle(E, F, G)
δ = Angle(C, D, E)