A = (5.605211139401542, 3.4103248523432703)
B = (0.8284783192961278, -1.996671325970496)
C = (13.566432506243904, -2.162530104446379)
đa giác1, c, a, b = Polygon(A, B, C)
α = Angle(C, B, A)
D = Mirror(A, a)
đa giác2, b_1, d, c_1 = Polygon(D, C, B)
β = Angle(A, C, B)
γ = Angle(B, C, D)