A = Intersect(xAxis, yAxis)
c = Circle(A, 1)
B = Intersect(c, xAxis, 2)
b = 0.16 (slider from 0 to 2, step 0.01)
D = Intersect(c, xAxis, 2)
D' = Rotate(D, b * π, A)
γ = Angle(D, A, D')
k = Segment(A, D')
l = OrthogonalLine(D', xAxis)
E = Intersect(l, xAxis)
r = Segment(D', E)
d = OrthogonalLine(A, k)
α = Angle(D, A, D')
texte4 = LaTeX(α, true, true)
h = Segment(A, E)
D'' = Mirror(D', h)
a = Segment(E, D'')
e = Segment(D'', A)
β = Angle(D'', A, E)