F_1

F_2

e

a

b

ε = 0.41 (slider from 0 to 1, step 0.01)
a = 2 (slider from 0.1 to 5, step 0.1)
e: (ε * a)
A: ((-e), 0)
B: (e, 0)
b: sqrt(a^(2) - e^(2))
C: (0, b)
c_{1} = Ellipse(A, B, C)
D = Point(c_{1})
c = Segment(A, D)
d = Segment(B, D)
d_{1}: c + d
E: (0, 0)
e_{2} = Segment(E, A)
i = Segment(C, (-C))
j = Segment(((-a), 0), (a, 0))
h = Segment(E, (a, 0))
f = Segment(E, C)
g: c + d
Text1: "c+d=" + (LaTeX[c]) + "+" + (LaTeX[d]) + "=" + (LaTeX[g]) + "=2\cdot a"
Text2: "e=\varepsilon\cdot a=" + (LaTeX[e_{2}]) + ""