A = (5.04, -6.32)
S_1 = (17.78, -4.44)
f = Line(A, S_1)
C = Point(f)
k_1 = Circle(S_1, C)
g = OrthogonalLine(S_1, f)
T_1 = Intersect(k_1, g, 2)
T_2 = Intersect(k_1, g, 1)
S_2 = Midpoint(T_1, S_1)
S_3 = Midpoint(S_1, T_2)
k_2 = Circle(S_2, S_1)
k_3 = Circle(S_3, S_1)
a = 0 (slider from 0 to 3, step 1)