Číslo kroku

S_1 = (9.4, -4.98)
S_3 = (22.04, -5.64)
p = Line(S_1, S_3)
T = Point(p)
S_2 = Point(p)
k_2 = Circle(S_2, T)
k_1 = Circle(S_1, T)
k_3 = Circle(S_3, T)
S_4 = Point(p)
k_4 = Circle(S_4, T)
a = 0 (slider from 0 to 2, step 1)