triangulation

Noun
  1. A trigonometric method of determining the position of a fixed point from the angles to it from two fixed points a known distance apart;
    Useful in navigation (synset 106017497)
    is a type of: trig, trigonometry - the mathematics of triangles and trigonometric functions
  2. A method of surveying;
    The area is divided into triangles and the length of one side and its angles with the other two are measured, then the lengths of the other sides can be calculated (synset 100618577)
    is a type of: surveying - the practice of measuring angles and distances on the ground so that they can be accurately plotted on a map

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