a = 0 (slider from 0 to 4, step 1)
A_{1} = (10.58, -10.34)
B = (23.68, -4.56)
p = Line(A_{1}, B)
S_{3} = (13.8, -4.62)
D = (18.12, -10.2)
k_{3} = Circle(S_{3}, D)
A = Point(k_{3})
C = (14.9282, -3.5094)
c = Parabola(A, p)
f = Line(S_{3}, A)
S_1 = Intersect(c, f, 1)
k_1 = Circle(S_1, A)
S_2 = Intersect(c, f, 2)
k_2 = Circle(S_2, A)