tri·an·gu·late /-ˌlet/
  (vt.)分成三角形,作三角測量,成三角形(a.)三角形的,由三角形而成的
  Tri·an·gu·late v. t. [imp. & p. p. Triangulated p. pr. & vb. n. Triangulating.]
  1. To divide into triangles; specifically, to survey by means of a series of triangles properly laid down and measured.
  2. To make triangular, or three-cornered.
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  triangulate
       adj : composed of or marked with triangles
       v 1: divide into triangles or give a triangular form to;
            "triangulate the piece of cardboard"
       2: measure by using trigonometry; "triangulate the angle"
       3: survey by triangulation; "The land surveyor worked by
          triangulating the plot"