Conic Sections
The family of curves including circles,
ellipses, parabolas,
and hyperbolas. All of these geometric
figures may be obtained by the intersection a double
cone with
a plane, hence
the name conic section. All conic sections have equations of
the form Ax^{2} + Bxy +
Cy^{2} + Dx +
Ey +
F = 0.
See
also
Eccentricity, degenerate
conic sections, focal
radius
