Define Triangulation and Trilateration.
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Triangulation is a method of surveying that is based on the trigonometric proposition that if one side and three angles of a triangle are known, the remaining sides can be computed. Furthermore, if the direction of one side is known, the direction of the remaining sides can be determined.
Trilateration is process of determining absolute or relative locations of points by measurement of distances using the geometry of circles, spheres of triangles.