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

Area :: Area (n.) The superficial contents of any figure; the surface included within any given lines; superficial extent; as, the area of a square or a triangle..

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

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

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

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..

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

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..

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

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

Equilateral :: Equilateral (a.) Having all the sides equal; as, an equilateral triangle; an equilateral polygon..

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

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

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

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

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

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