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

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

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

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..

Transmutation :: Transmutation (n.) The change or reduction of one figure or body into another of the same area or solidity, but of a different form, as of a triangle into a square..

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

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..

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

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..

Transversal :: Transversal (n.) A straight line which traverses or intersects any system of other lines, as a line intersecting the three sides of a triangle or the sides produced..

Acute-angled :: Acute-angled (a.) Having acute angles; as, an acute-angled triangle, a triangle with every one of its angles less than a right angle..

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..

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

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

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

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

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

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