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Cepheus :: Cepheus (n.) A northern constellation near the pole. Its head, which is in the Milky Way, is marked by a triangle formed by three stars of the fourth magnitude. See Cassiopeia..

Trinity :: Trinity (n.) Any symbol of the Trinity employed in Christian art, especially the 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..

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

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

Isosceles :: Isosceles (a.) Having two legs or sides that are equal; -- said of a triangle.

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

Obtuse-angular :: obtuse-angular (a.) Having an obtuse angle; as, an obtuse-angled triangle..

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

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..

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..

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..

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

Escribed :: Escribed (a.) Drawn outside of; -- used to designate a circle that touches one of the sides of a given triangle, and also the other two sides produced..

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

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

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

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

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..

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

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