A = (0.58, -0.28)
C = (4.54, 0.24)
a = Segment(A, C)
b_1 = OrthogonalLine(C, a)
B = Point(b_1)
c = Segment(A, B)
b = Segment(B, C)
Etape = 0 (slider from 0 to 6, step 1)
α = Angle(B, C, A)
e = OrthogonalLine(C, c)
D = Intersect(e, c)
β = Angle(C, D, B)
f = Segment(D, C)
γ = Angle(C, A, D)
δ = Angle(A, D, C)
ε = Angle(D, C, A)
ζ = Angle(D, B, C)
c_1 = Segment(A, D)
c_2 = Segment(D, B)
η = Angle(B, C, D)