Číslo kroku

A = (11.722114496226032, -1.239030466034245)
B = (16.86, -1.24)
f = Line(A, B)
g = OrthogonalLine(A, f)
n = 0 (slider from 0 to 1, step 1)
S = Point(g)
c = Circle(S, A)