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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..

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..

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..

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

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

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..

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..

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

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..

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..

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..

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

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..

Orthocenter :: Orthocenter (n.) That point in which the three perpendiculars let fall from the angles of a triangle upon the opposite sides, or the sides produced, mutually intersect..

Triangle :: Triangle (n.) A small constellation situated between Aries and Andromeda.

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

Trigon :: Trigon (n.) A figure having three angles; a 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..

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