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+In 3D Euclidean space, the position of a point is uniquely determined by its distance from three other (distinct, non-colinear) points (mostly; in some cases there may be two solutions). Trilateration is the process of finding a point from three of these distance/point pairs - strictly speaking, this is "true range" trilateration (or, more generally, multilateration), and the more widely used pseudo-range trilateration (multilateration) uses four distances instead.
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