S = (1.66, 1.88)
B = (2.12, 3.9)
k = Circle(S, B)
X = Point(k)
Y = Point(k)
t_1 = Line(X, Y)
m = 9 (slider from 0 to 10, step 0.05)
t = Tangent(X, k)
h = Segment(X, S)
k_1 = Circle(X, sqrt(m))
Q = Intersect(k_1, t, 2)
l = Circle(S, Q)
A = Intersect(l, t_1, 1)
a = Distance(A, X)
b = Distance(A, Y)
i: (a * b)
f = Segment(Q, S)