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

Transversal :: Transversal (n.) A straight line which traverses or intersects any system of other lines, as a line intersecting the three sides of a triangle or the sides produced..

Side :: Side (n.) The margin, edge, verge, or border of a surface; especially (when the thing spoken of is somewhat oblong in shape), one of the longer edges as distinguished from the shorter edges, called ends; a bounding line of a geometrical figure; as, the side of a field, of a square or triangle, of a river, of a road, etc..

Triangle :: Triangle (n.) A figure bounded by three lines, and containing three angles..

Spider''s Web :: Spider's web () The silken web which is formed by most kinds of spiders, particularly the web spun to entrap their prey. See Geometric spider, Triangle spider, under Geometric, and Triangle..

Oblique-angled :: Oblique-angled (a.) Having oblique angles; as, an oblique-angled triangle..

Chorograph :: Chorograph (n.) An instrument for constructing triangles in marine surveying, etc..

Three-square :: Three-square (a.) Having a cross section in the form of an equilateral triangle; -- said especially of a kind of file.

Triangle :: Triangle (n.) An instrument of percussion, usually made of a rod of steel, bent into the form of a triangle, open at one angle, and sounded by being struck with a small metallic rod..

Triangulation :: Triangulation (n.) 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 the several points connected by them..

Coincide :: Coincide (n.) To occupy the same place in space, as two equal triangles, when placed one on the other..

Trigon :: Trigon (n.) A figure having three angles; a triangle.

Acute-angled :: Acute-angled (a.) Having acute angles; as, an acute-angled triangle, a triangle with every one of its angles less than a right angle..

Cathetus :: Cathetus (n.) One line or radius falling perpendicularly on another; as, the catheti of a right-angled triangle, that is, the two sides that include the right angle..

Subtense :: Subtend (v. t.) To extend under, or be opposed to; as, the line of a triangle which subtends the right angle; the chord subtends an arc..

Triangulate :: Triangulate (v. t.) To divide into triangles; specifically, to survey by means of a series of triangles properly laid down and measured..

Trilateral :: Trilateral (a.) Having three sides; being three-sided; as, a trilateral triangle..

Cone :: Cone (n.) A solid of the form described by the revolution of a right-angled triangle about one of the sides adjacent to the right angle; -- called also a right cone. More generally, any solid having a vertical point and bounded by a surface which is described by a straight line always passing through that vertical point; a solid having a circle for its base and tapering to a point or vertex..

Altitude :: Altitude (n.) The perpendicular distance from the base of a figure to the summit, or to the side parallel to the base; as, the altitude of a triangle, pyramid, parallelogram, frustum, etc..

Hypothenuse :: Hypothenuse (n.) The side of a right-angled triangle that is opposite to the right angle.

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