A = (2.1221767914080103, 2.547859204268682)
B = (11.178066096191188, 2.9127485169156233)
D = (0.6626195408202458, -3.5225720879486135)
đa giác1, c, a, b = Polygon(A, B, D)
d = Line(B, b)
e = Line(D, c)
C = Intersect(d, e)
đa giác2, b_1, c_1, d_1 = Polygon(D, C, B)
α = Angle(A, B, D)
β = Angle(C, D, B)
γ = Angle(B, D, A)
δ = Angle(D, B, C)