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)
a = Line(D', A)
C, F = Intersect(c, a)
G, H = Intersect(c, xAxis)
β = Angle(G, A, F)
e = OrthogonalLine(F, xAxis)
I = Intersect(xAxis, e)
f = Segment(I, F)
g = Segment(I, A)
h = Segment(A, E)