A_{1} = (3.74, -5.22)
B = (26.78, -7.24)
f = Line(A_{1}, B)
T = Point(f)
g = OrthogonalLine(T, f)
S_{1} = Point(g)
A = Point(g)
k_1 = Circle(S_{1}, A)
a = 0 (slider from 0 to 3, step 1)
S_2 = Midpoint(T, A)
k_2 = Circle(S_2, T)