Foci
of a Hyperbola
Two fixed points located inside each curve of
a hyperbola that are used in the
curve's formal definition. A hyperbola is defined as follows: For
two given points, the
foci, a hyperbola is the locus of points such that the difference
between
the distance to each focus is constant.
See
also
Directrices
of a hyperbola, foci of an ellipse,
focus of a parabola, focal radius
