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TRIANGULATION
Measuring the 3 angles of a triangle plus the coordinates of the 2 base points, the coordinates of the 3rd point can be calculated.
TRILATERATION
Measuring the 3 sides of a triangle the 3 angles can be computed. With the coordinates of 2 points the 3rd can be calculated.
Example of Machine Trilateration/Triangulation sheet. Click image to view in full detail.