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

Triangle :: Triangle (n.) A draughtsman's square in the form of a right-angled triangle.

Pentacle :: Pentacle (n.) A figure composed of two equilateral triangles intersecting so as to form a six-pointed star, -- used in early ornamental art, and also with superstitious import by the astrologers and mystics of the Middle Ages..

Right-angled :: Right-angled (a.) Containing a right angle or right angles; as, a right-angled triangle..

Tetrahedron :: Tetrahedron (n.) A solid figure inclosed or bounded by four triangles.

Orthocenter :: Orthocenter (n.) That point in which the three perpendiculars let fall from the angles of a triangle upon the opposite sides, or the sides produced, mutually intersect..

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

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

Scalene :: Scalene (a.) Having the sides and angles unequal; -- said of a triangle.

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..

Base :: Base (n.) A line in a survey which, being accurately determined in length and position, serves as the origin from which to compute the distances and positions of any points or objects connected with it by a system of triangles..

Scalenohedron :: Scalenohedron (n.) A pyramidal form under the rhombohedral system, inclosed by twelve faces, each a scalene triangle..

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

Transmutation :: Transmutation (n.) The change or reduction of one figure or body into another of the same area or solidity, but of a different form, as of a triangle into a square..

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..

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..

Oxygon :: Oxygon (n.) A triangle having three acute 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..

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..

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..

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