A = (1.0775720230251358, -0.29415296458175433)
B = (7.530572590240107, -0.40596238035033033)
C = (-1.557935634377014, 3.012211187431852)
đa giác1, c, a, b = Polygon(A, B, C)
α = Angle(A, C, B)
β = Angle(C, B, A)
γ = Angle(B, A, C)