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

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

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

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

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..

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..

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..

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..

Triangled :: Triangled (a.) Having three angles; triangular.

Cuproid :: Cuproid (n.) A solid related to a tetrahedron, and contained under twelve equal triangles..

Sphenoid :: Sphenoid (n.) A wedge-shaped crystal bounded by four equal isosceles triangles. It is the hemihedral form of a square pyramid.

Equivalent :: Equivalent (a.) Equal in measure but not admitting of superposition; -- applied to magnitudes; as, a square may be equivalent to a triangle..

Rib :: Rib (n.) In Gothic vaulting, one of the primary members of the vault. These are strong arches, meeting and crossing one another, dividing the whole space into triangles, which are then filled by vaulted construction of lighter material. Hence, an imitation of one of these in wood, plaster, or the like..

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..

Octahedron :: Octahedron (n.) A solid bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles.

Produce :: Produce (v. t.) To extend; -- applied to a line, surface, or solid; as, to produce a side of a triangle..

Triangle :: Triangle (n.) A kind of frame formed of three poles stuck in the ground and united at the top, to which soldiers were bound when undergoing corporal punishment, -- now disused..

Spherograph :: Spherograph (n.) An instrument for facilitating the practical use of spherics in navigation and astronomy, being constructed of two cardboards containing various circles, and turning upon each other in such a manner that any possible spherical triangle may be readily found, and the measures of the parts read off by inspection..

Circumcenter :: Circumcenter (n.) The center of a circle that circumscribes a triangle.

Triangle :: Triangle (n.) A small constellation near the South Pole, containing three bright stars..

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