Číslo kroku

B = (-6.181925259870641, 17.955293411359264)
B_{1} = (2.4262501047755487, 12.678467441227994)
A = (-5.3398244648817075, 19.334287341933106)
D = (-1.6638482745724206, 18.368664433611254)
k = Circle(A, D)
B' = Mirror(B, k)
g, h = Tangent(B', k)
k_2 = Mirror(g, k)
k_1 = Mirror(h, k)
a = 0 (slider from 0 to 4, step 1)