**Foci of a Hyperbola**

Two fixedpoints 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

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