triangle

triangle
—triangled, adj.
/truy"ang'geuhl/, n.
1. a closed plane figure having three sides and three angles.
2. a flat triangular piece, usually of plastic, with straight edges, used in connection with a T square for drawing perpendicular lines, geometric figures, etc.
3. any three-cornered or three-sided figure, object, or piece: a triangle of land.
4. a musical percussion instrument that consists of a steel triangle, open at one corner, that is struck with a steel rod.
5. a group of three; triad.
6. a situation involving three persons, esp. one in which two of them are in love with the third.
7. (cap.) Astron. the constellation Triangulum.
[1350-1400; ME < L triangulum, n. use of neut. of triangulus three-cornered. See TRI-, ANGLE1]

* * *

Geometric figure with three sides and three angles.

Each two sides meet at a point called a vertex, and the three angles sum to 180°. A triangle with one 90° (right) angle is a right triangle. A triangle with all sides (and thus all angles) equal is equilateral, one with two sides equal is isosceles, and one with no two sides equal is scalene. Triangles are particularly useful in surveying, astronomy, and navigation. Two observation points (sight lines) form a triangle with a reference object serving as one vertex and the observation points as the other two. Knowing the angles of the sight lines and the distance between the observation points allows the calculation of the lengths of the other sides using the methods of trigonometry.

* * *

  percussion instrument consisting of a steel rod bent into a triangle with one corner left open. It is suspended by a gut or nylon loop and struck with a steel rod. It is theoretically an instrument of indefinite pitch, for its fundamental pitch is obscured by its inharmonic partials (component tones). Some players, however, perceive a suggestion of pitch and often possess more than one instrument. A single stroke on the triangle clearly penetrates the full force of an orchestra, and it is perhaps most effective when used sparingly.

      The triangle was known by the 14th century and was sometimes trapezoidal in form; until about 1800 it often had jingling rings. With cymbals (cymbal) and bass drums (bass drum), triangles were basic to the Turkish Janissary music (Janissary music) in vogue in 18th-century Europe, entering the orchestra at that time as a device for local colour. In the 19th century it began to be used purely for its sound, as in Franz Liszt's (Liszt, Franz) Piano Concerto No. 1 in E-flat Major (Triangle Concerto).

* * *


Universalium. 2010.

Игры ⚽ Нужна курсовая?
Synonyms:
,


Look at other dictionaries:

  • triangle — [ trijɑ̃gl ] n. m. • v. 1270; lat. triangulum 1 ♦ Figure géométrique, polygone plan à trois côtés. Les trois côtés, les trois sommets, les trois angles d un triangle. Triangle quelconque, scalène, isocèle, équilatéral. Triangle rectangle, qui a… …   Encyclopédie Universelle

  • Triangle — Tri an gle, n. [L. triangulum, fr. triangulus triangular; tri (see {Tri }) + angulus angle: cf. F. triangle. See {Angle} a corner.] 1. (Geom.) A figure bounded by three lines, and containing three angles. [1913 Webster] Note: A triangle is either …   The Collaborative International Dictionary of English

  • Triangle K — is a kosher supervision and certification organization under the leadership of Rabbis Jehoseph H. and Aryeh R. Ralbag.cite web url = http://www.trianglek.org/ title = Triangle K and Associates: Kosher Certification and Supervision accessdate =… …   Wikipedia

  • Triangle — ist ein 429 m hoch gelegener Ort mit etwa 2.000 Einwohnern in der Provinz Masvingo in Simbabwe; gelegen an der Straße und Eisenbahnlinie Mbizi Chiredzi. Triangle liegt in einer heißen und trockenen Region. Um landwirtschaftlichen Anbau zu… …   Deutsch Wikipedia

  • triangle — m. triangle > Triangle isocèle : triangle isocèle …   Diccionari Personau e Evolutiu

  • Triangle — Triangle, VA U.S. Census Designated Place in Virginia Population (2000): 5500 Housing Units (2000): 2318 Land area (2000): 2.633489 sq. miles (6.820706 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 2.633489 sq …   StarDict's U.S. Gazetteer Places

  • Triangle, VA — U.S. Census Designated Place in Virginia Population (2000): 5500 Housing Units (2000): 2318 Land area (2000): 2.633489 sq. miles (6.820706 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 2.633489 sq. miles… …   StarDict's U.S. Gazetteer Places

  • triangle — late 14c., from O.Fr. triangle (13c.), from L. triangulum triangle, from neut. of adj. triangulus three cornered, from tri three (see TRI (Cf. tri )) + angulus corner, angle (see ANGLE (Cf. angle) (n.)). In the huts of w …   Etymology dictionary

  • triangle — ► NOUN 1) a plane figure with three straight sides and three angles. 2) something in the form of a triangle. 3) a musical instrument consisting of a steel rod bent into a triangle, sounded with a rod. 4) an emotional relationship involving a… …   English terms dictionary

  • Triangle — Episodio de Buffy the Vampire Slayer Título Triángulo Identificador 5ABB011 Episodio nº 11 Temporada 5 …   Wikipedia Español

  • Triangle d'or — (le) région figurant un triangle, aux frontières du Laos, de la Thaïlande et de la Birmanie, ainsi nommée pour son importante production d opium …   Encyclopédie Universelle

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”