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

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

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..

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.

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..

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

Kathetal :: Kathetal (a.) Making a right angle; perpendicular, as two lines or two sides of a triangle, which include a right angle..

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..

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..

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..

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

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

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

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..

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..

Chorograph :: Chorograph (n.) An instrument for constructing triangles in marine surveying, etc..

Pentacle :: Pentacle (n.) A figure composed of two equilateral triangles intersecting so as to form a six-pointed star, -- used in early ornamental art, and also with superstitious import by the astrologers and mystics of the Middle Ages..

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..

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

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..

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