A point P and a triangle ABC, the distances from P to the three vertices of the triangle being known and the four points being coplanar [Un point P et un triangle ABC, les distances de P aux trois sommets du triangle étant connues et 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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