S_1 = (5.54, 1.54)
B = (3.48, 4.28)
k_1 = Circle(S_1, B)
A = Point(k_1)
D = (1.5, -3.78)
E = (13.38, -1.88)
p = Line(D, E)
g = Tangent(A, k_1)
h, i = AngularBisector(g, p)
j = Line(S_1, A)
S_3 = Intersect(h, j)
k_3 = Circle(S_3, A)
S_2 = Intersect(i, j)
k_2 = Circle(S_2, A)
a = 0 (slider from 0 to 5, step 1)