F_1 = (1.58, 0.46)
F_2 = (6.42, 0.44)
C = (6.640000000000001, 3.3200000000000003)
c = Ellipse(F_1, F_2, C)
a = Line(F_1, F_2)
D, E = Intersect(c, a)
b = Segment(D, E)