Degenerate Conic Sections
Plane figures that can be
obtained by the intersection of a double
cone with a plane passing through
the apex. These include a point, a line,
and intersecting lines.
Like other conic sections, all degenerate conic sections have equations of the form Ax2 + Bxy +
Cy2 + Dx +
Ey + F = 0.

See also
Degenerate
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