A = (-0.9504824740386941, 6.279081143370347)
D = (-0.928227815050666, 1.2495282120759446)
a = Segment(A, D)
b = OrthogonalLine(A, a)
c = OrthogonalLine(D, a)
B = Point(b)
C = Point(c)
đa giác1, a_1, c_1, d, b_1 = Polygon(A, B, C, D)
α = Angle(D, A, B)
β = Angle(C, D, A)