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The series or network of triangles into which the face of a country, or any portion of it, is divided in a trigonometrical survey; the operation of measuring the elements necessary to determine the triangles into which the country to be surveyed is supposed to be divided, and thus to fix the positions and distances of…

A figure having three angles; a triangle.

That branch of mathematics which treats of the relations of the sides and angles of triangles, which the methods of deducing from certain given parts other required parts, and also of the general relations which exist between the trigonometrical functions of arcs or angles.

Having three sides; being three-sided; as, a trilateral triangle. -- Tri*lat"er*al*ly, adv. -- Tri*lat"er*al*ness, n.

Any symbol of the Trinity employed in Christian art, especially the triangle. Trinity House, an institution in London for promoting commerce and navigation, by licensing pilots, ordering and erecting beacons, and the like. -- Trinity Sunday, the Sunday next after Whitsunday; -- so called from the feast held on that da…

Having three quadrants; thus, a triquadrantal triangle is one whose three sides are quadrants, and whose three angles are consequently right angles.

ahedron. -- Trigonal trisoctahedron, a trisoctahedron each face of which is an isosceles triangle.

another behind. Next, a cingulum was developed, and the three cones became arranged in a triangle, the two smaller cusps having moved to the outer side in upper and to the inner in lower molars. This primitive triangle is called the trigon or trigonid and this stage the tritubercular or trigonodont. The trigon being a…