O = Intersect(xAxis, yAxis)
D = (1, 0)
c = Circle(O, D)
α = 0.6283185307179586 rad (slider from 0 to 6.283185307179586, step 2*°)
A = Rotate(D, α, O)
β = Angle(D, O, A)
B = Rotate(D, (3 * α), O)
γ = Angle(D, O, B)
a = Line(A, B)
b = Segment(O, A)
d = Segment(O, B)