# Trilateration

## Use of distances for determining unknown coordinates of a point / From Wikipedia, the free encyclopedia

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**Trilateration** is the use of distances (or "ranges") for determining the unknown position coordinates of a point of interest, often around Earth (geopositioning).^{[1]}
When more than three distances are involved, it may be called **multilateration**, for emphasis.

The distances or ranges might be ordinary Euclidean distances (slant ranges) or spherical distances (scaled central angles), as in *true-range multilateration*; or biased distances (pseudo-ranges), as in *pseudo-range multilateration*.

Trilateration or multilateration should not be confused with *triangulation*, which uses angles for positioning; and *direction finding*, which determines the line of sight direction to a target without determining the radial distance.