F_1 = (-0.7688828507128057, 1.412334889303668)
F_2 = (7.848761582639418, 1.412334889303668)
d = Segment(F_1, F_2)
c: d / 2.0
a = 2.7 (slider from 0 to 5, step 0.1)
x_1: x(F_1)
y_1: y(F_1)
x_2: x(F_2)
y_2: y(F_2)
b = Line(F_1, F_2)
e = Circle(F_1, a + c)
A = Intersect(e, b, 2.0)
f = Hyperbola(F_1, F_2, A)
M = Point(f)
g = Segment(F_1, M)
h = Segment(M, F_2)