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A pyramidal form under the rhombohedral system, inclosed by twelve faces, each a scalene triangle.

Having the two things that are conjugate parts of the same figure; as, self-conjugate triangles.

ed 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.

cle whose radius is unity, the sine of the arc that measures the angle; in a right-angled triangle, the side opposite the given angle divided by the hypotenuse. See Trigonometrical function, under Function. -- Versed sine, that part of the diameter between the sine and the arc.

A mystic symbol consisting of two interlaced triangles forming a star with six points, often with one triangle dark and one light, symbolic of the union of soul and body.

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

Sector. -- Spherical segment, the segment of a sphere. See under Segment. -- Spherical triangle,re on the surface of a sphere, bounded by the arcs of three great circles which intersect each other. -- Spherical trigonometry. See Trigonometry. -- Spher"ic*al*ly, adv. -- Spher"ic*al*ness, n.

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.

t kinds of spiders, particularly the web spun to entrap their prey. See Geometric spider, Triangle spider, under Geometric, and Triangle.

se, 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. Brande & C.

To extend under, or be opposed to; as, the line of a triangle which subtends the right angle; the chord subtends an arc.

a single base, and connecting it with various points in the tract surveyed by a series of triangles, the angles of which are carefully measured, the relative positions and distances of all parts being computed from these data.

A solid figure inclosed or bounded by four triangles.

Having a cross section in the form of an equilateral triangle; -- said especially of a kind of file.

igure or body into another of the same area or solidity, but of a different form, as of a triangle into a square. [R.]

rses or intersects any system of other lines, as a line intersecting the three sides of a triangle or the sides produced.

ce may be found by inspection. It contains the lengths of the two sides of a right-angled triangle, usually for every quarter of a degree of angle, and for lengths of the hypothenuse, from 1 to 100. (b) (Railroad) A platform with one or more tracks, and arranged to move laterally on wheels, for shifting cars, etc., fro…

Having three angles; having the form of a triangle.

In a triangular manner; in the form of a triangle. Dampier.

To divide into triangles; specifically, to survey by means of a series of triangles properly laid down and measured.