Bidimensional localization of a point P its distances to the three vertices of a triangle ABC being known, the four points being coplanar [Localisation bidimensionnelle d'un point P connaissant ses distances aux trois sommets d'un triangle ABC, les quatre points étant coplanaires].

This is a very simplified explanation of the process used for the 'GPS' (Navstar Global Positionning System). In particular with the bidimensional one when obviously the actual 'GPS' is trdimensional and must take into accounts the special and general relativities!

See the bidimensional process:

See the tridimensional process:

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