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Pyramid :: Pyramid (n.) A solid figure contained by a plane rectilineal figure as base and several triangles which have a common vertex and whose bases are sides of the base.

Revolution :: Revolution (n.) The motion of a point, line, or surface about a point or line as its center or axis, in such a manner that a moving point generates a curve, a moving line a surface (called a surface of revolution), and a moving surface a solid (called a solid of revolution); as, the revolution of a right-angled triangle about one of its sides generates a cone; the revolution of a semicircle about the diameter generates a sphere..

Trigon :: Trigon (n.) A kind of game at ball played by three persons standing at the angular points of a triangle.

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

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

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

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..

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..

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

Scalene :: Scalene (n.) A triangle having its sides and angles unequal.

Incenter :: Incenter (n.) The center of the circle inscribed in a triangle.

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

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

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..

Wing :: Wing (n.) That part of the hold or orlop of a vessel which is nearest the sides. In a fleet, one of the extremities when the ships are drawn up in line, or when forming the two sides of a triangle..

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

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

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