## Geometry and Trigonometry## Analytic Geometry |

## How are three-dimensional Cartesian coordinates determined? |

The three-dimensional coordinates are those that describe a solid or three-dimensional object with three axes (or three planes): the usual two axes (as in the two-dimensional system), and an additional line. The coordinates are usually written in terms of *x, y,* and *z,* and are often called *ordered triples* or just triples.