a = 0 (slider from 0 to 4, step 1)
A_{1} = (1, -3.6)
B_{1} = (12.98, -2.2)
p = Line(A_{1}, B_{1})
B = Point(p)
A = (0.54, -0.308)
ω = Circle(B, A)
f = Line(A, p)
k = Mirror(f, ω)
S = Center(k)