Číslo kroku

A = (-8.3, -1.56)
B = (1.74, -1.6)
p = Line(A, B)
S: (-3.4, 4.4)
D = (-2.1, 3.08)
k = Circle(S, D)
f = OrthogonalLine(S, p)
C = Intersect(f, p)
c = Circle(C, Radius[k])
E = Intersect(c, f, 1)
F = Intersect(c, f, 2)
g = Line(F, p)
h = Line(E, p)
d = Parabola(S, g)
e = Parabola(S, h)
a = 0 (slider from 0 to 5, step 1)