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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..

Triangular :: Triangular (a.) Having three angles; having the form of a triangle.

Converse :: Converse (n.) A proposition in which, after a conclusion from something supposed has been drawn, the order is inverted, making the conclusion the supposition or premises, what was first supposed becoming now the conclusion or inference. Thus, if two sides of a sides of a triangle are equal, the angles opposite the sides are equal; and the converse is true, i.e., if these angles are equal, the two sides are equal..

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..

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

Trigonometry :: Trigonometry (n.) 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..

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

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

Subcontrary :: Subcontrary (a.) Having, or being in, a contrary order; -- said of a section of an oblique cone having a circular base made by a plane not parallel to the base, but so inclined to the axis that the section is a circle; applied also to two similar triangles when so placed as to have a common angle at the vertex, the opposite sides not being parallel..

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

Birectangular :: Birectangular (a.) Containing or having two right angles; as, a birectangular spherical triangle..

Amblygon :: Amblygon (n.) An obtuse-angled figure, esp. and obtuse-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..

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..

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..

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

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

Triangularly :: Triangularly (adv.) In a triangular manner; in the form of a triangle.

Pyramid :: Pyramid (n.) The game of pool in which the balls are placed in the form of a triangle at spot.

Self-conjugate :: Self-conjugate (a.) Having the two things that are conjugate parts of the same figure; as, self-conjugate triangles..

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