A = (-0.09885382909773055, 2.4500852805730844)
B = (8.135292512365677, 2.311529933481152)
a = Segment(A, B)
D = (-1.2666774688725895, -0.9742111546989607)
b = Segment(A, D)
c = Line(D, a)
d = Line(B, b)
C = Intersect(c, d)
đa giác1, a_1, c_1, d_1, b_1 = Polygon(A, D, C, B)
α = Angle(C, D, A)
β = Angle(B, C, D)