A = Intersect(xAxis, yAxis)
B = (1, 0)
c = Circle(A, B)
α = 0 rad (slider from 0 to 6.283185307179586, step 2*°)
C = Rotate(B, α, A)
β = Angle(B, A, C)
D = Rotate(B, (4 * α), A)
γ = Angle(B, A, D)
b = Segment(A, C)
d = Segment(A, D)
a = Segment(D, C)