A = (-0.36, 2.48)
B = (2.1799999999999993, 3.52)
P = (3.9399999999999995, 2.8599999999999994)
a = Segment(A, B)
A' = Mirror(A, P)
B' = Mirror(B, P)
b = Segment(A', B')
c = Line(A, B)
d = Line(A', B')
e = OrthogonalLine(P, c)
C = Intersect(c, e)
C' = Mirror(C, P)
α = Angle(A, C, P)