A = (2, 4)
B = Point(c)
O = Intersect(xAxis, yAxis)
a = Segment(O, B)
b = Line(O, B)
d = OrthogonalLine(A, b)
C, D = Intersect(c, d)
M = Midpoint(D, C)
α = Angle(B, M, A)
e = Segment(A, O)