A = Intersect(xAxis, yAxis)
B = Point(xAxis)
c = Circle(A, B)
C = Point(c)
a = Line(A, C)
D = Point(a)
b = OrthogonalLine(D, a)
E = Point(b)
F = Point(a)
β = Angle(F, D, E)
G, H = Intersect(c, b)