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Hypothenuse :: Hypothenuse (n.) The side of a right-angled triangle that is opposite to 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..

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..

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

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..

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..

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

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

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

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

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..

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..

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

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..

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..

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

Three-square :: Three-square (a.) Having a cross section in the form of an equilateral triangle; -- said especially of a kind of file.

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..

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

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

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