**Ellipsoid - Wikipedia**
https://en.wikipedia.org/wiki/Ellipsoid

Standard equation. Using a Cartesian coordinate system in which the origin is the center of the ellipsoid and the coordinate axes are axes of the ellipsoid, the implicit equation of the ellipsoid has the standard form + + =, where a, b, c are positive real numbers.. The points (a, 0, 0), (0, b, 0) and (0, 0, c) lie on the surface. The line segments from the origin to these points are called ...

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