A = (3.3926550345332687, 4.355719889655799)
B = (3.502121828327351, -3.160999950871191)
C = (-4.81735450002291, -7.357227046311017)
đa giác1, c, a, b = Polygon(A, B, C)
D = Mirror(C, c)
đa giác2, b_1, a_1, c' = Polygon(A, D, B)
α = Angle(C, A, B)
β = Angle(B, A, D)
γ = Angle(A, B, C)
δ = Angle(D, B, A)