A = (1.94, 4.22)
B = (-0.78, 1.04)
Γ_1 = (2.74, 0.88)
poly1, c, a, b = Polygon(A, B, Γ_1)
D = (4.22, 2.62)
A' = Mirror(A, D)
B' = Mirror(B, D)
Γ = Mirror(Γ_1, D)
poly1', c', a', b' = Polygon(A', B', Γ)
α = Angle(B, A, Γ_1)
β = Angle(Γ_1, B, A)
γ = Angle(B', A', Γ)
δ = Angle(Γ, B', A')
ε = Angle(A, Γ_1, B)
ζ = Angle(A', Γ, B')