đoạn dây = CF_2 + CA = AB - 2a

F_1 = (-0.7688828507128057, 1.412334889303668)
F_2 = (7.848761582639418, 1.412334889303668)
d = Segment(F_1, F_2)
c: d / 2.0
a = 2.6 (slider from 0 to 5, step 0.1)
b = Line(F_1, F_2)
e = Circle(F_1, a + c)
A_1 = Intersect(e, b, 2.0)
f = Hyperbola(F_1, F_2, A_1)
B = (-0.7301173418910627, 1.4143259510324473)
C_1 = (-13.904622436105583, -6.581521480361915)
D = (3.702813617483014, -6.830097048177284)
i = Segment(C_1, D)
k = Circle(B, i)
A = Point(k)
j = Segment(B, A)
l = OrthogonalLine(B, j)
F = Point(l)
m = OrthogonalLine(A, j)
n = OrthogonalLine(F, l)
G = Intersect(m, n)
Tên đa giác1, f_1, b_1, e_1, g_1 = Polygon(F, B, A, G)
C, I = Intersect(f, b_1)
g = Segment(F_2, C)
h = Segment(C, A)