O = (2.534678492239472, -0.48492239467849374)
X' = (-2.751352549889132, -0.5381374722838153)
a = Line(X', O)
b = OrthogonalLine(O, a)
X = Point(a)
Y = Point(b)
Y' = Point(b)
α = Angle(X, O, Y)