A = Intersect(xAxis, yAxis)
B = Point(xAxis)
C = (0, 1)
D = Point(yAxis)
c = CircumcircleArc(C, B, D)
E = Point(c)
α = Angle(B, A, E)
F: (y(E), α * y(E) / abs(y(E)))
G: (x(E), 0.0)
a = Segment(E, G)
H: (y(E), 0.0)
b = Segment(A, H)
α' = Segment(H, F)
d = Segment(E, A)