三さん辺ぺん測そく量りょう

noun

trilateration

Technical term in surveying and geodesy: determining a position by measuring the lengths of the three sides of a triangle, as opposed to triangulation which uses angles.

• GPSの位い置ち測そく定ていには三さん辺ぺん測そく量りょうの原げん理りが使つかわれている。

  The principle of trilateration is used in GPS positioning.