A = (-5.131726868241586, -7.003810779369202)
B = (4.784194157608754, -6.964924814561946)
a = Segment(A, B)
b = OrthogonalLine(A, a)
C = Point(b)
c = Segment(C, B)
d = Segment(C, A)
α_1 = Angle(B, A, C)
α = Angle(A, C, B)
β = Angle(C, B, A)