B = (117.14998662736197, 56.99499970180568)
O = (129.48365005852637, 93.885770485233)
C = (161.18432649500826, 93.885770485233)
a = Line(O, C)
X = (231.15777082431586, 173.91064880659584)
b = Segment(O, X)
E = Point(a)
α = Angle(X, O, E)