triangle

top: right triangle

bottom: equilateral triangle

tri·an·gle

(trī′ăng′gəl)

a. The plane figure formed by connecting three points not in a straight line by straight line segments; a three-sided polygon.

b. Something shaped like such a figure: a triangle of land.

2. Any of various flat, three-sided drawing and drafting guides, used especially to draw straight lines at specific angles.

3. Music A percussion instrument consisting of a piece of metal in the shape of a triangle open at one angle.

4. A relationship involving three people, especially a ménage à trois.

[Middle English, from Old French, from Latin triangulum, from neuter of triangulus, three-angled : tri-, tri- + angulus, angle.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

triangle

(ˈtraɪˌæŋɡəl)

1. (Mathematics) geometry a three-sided polygon that can be classified by angle, as in an acute triangle, or by side, as in an equilateral triangle. Sum of interior angles: 180°; area: base × height

2. any object shaped like a triangle

3. any situation involving three parties or points of view. See also eternal triangle

4. (Instruments) music a percussion instrument consisting of a sonorous metal bar bent into a triangular shape, beaten with a metal stick

5. a group of three

[C14: from Latin triangulum (noun), from triangulus (adjective), from tri- + angulus corner]

ˈtriˌangled adj

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

tri•an•gle

art at tribrach

(ˈtraɪˌæŋ gəl)

n.

1. a closed plane figure having three sides and three angles.

2. a flat triangular piece 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.

[1350–1400; Middle English < Latin triangulum, n. use of neuter of triangulus three-cornered. See tri-, angle¹]

tri′an`gled, adj.

triangle

The area (A) of a triangle can be calculated using the following formula: A = ¹/₂ bh.

tri·an·gle

(trī′ăng′gəl)

A closed geometric figure consisting of three sides.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Triangle

a set of three.

Example: long wavering triangle of waterfowl, 1895.

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun	1.	triangle - a three-sided polygon trigon, trilateral polygon, polygonal shape - a closed plane figure bounded by straight sides acute triangle, acute-angled triangle - a triangle whose interior angles are all acute equiangular triangle, equilateral triangle - a three-sided regular polygon isosceles triangle - a triangle with two equal sides oblique triangle - a triangle that contains no right angle obtuse triangle, obtuse-angled triangle - a triangle that contains an obtuse interior angle right triangle, right-angled triangle - a triangle with one right angle scalene triangle - a triangle with no two sides of equal length cuneus, wedge, wedge shape - any shape that is triangular in cross section
	2.	triangle - something approximating the shape of a triangle; "the coastline of Chile and Argentina and Brazil forms two legs of a triangle" shape, form - the spatial arrangement of something as distinct from its substance; "geometry is the mathematical science of shape"
	3.	Triangle - a small northern constellation near Perseus between Andromeda and Aries Triangulum
	4.	triangle - any of various triangular drafting instruments used to draw straight lines at specified angles drafting instrument - an instrument used by a draftsman in making drawings
	5.	triangle - a percussion instrument consisting of a metal bar bent in the shape of an open triangle percussion instrument, percussive instrument - a musical instrument in which the sound is produced by one object striking another

Translations

مُثَلَّثمُثَلَّث موسيقي

triangltrojúhelník

trekanttriangel

triangulo

kolmiotriangeli

trokuttriangl

háromszögtriangulum

òríhornòríhyrningurþríhornþríhyrningur

triangolo l'eterno triangolo triangolare

トライアングル三角形

삼각형트라이앵글

triangulum

trikampis

trijstūris

triangel

trikotniktriangel

triangeltrehörningtrekant

กิ๋ง เครื่องดนตรีรูปสามเหลี่ยมสามเหลี่ยม

üçgentriangelüç köşe

hình tam giáckẻng ba gốc

三角三角铁三角形

triangle

[ˈtraɪæŋgl] N (also Mus) → triángulo m

Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

triangle

[ˈtraɪæŋg^əl] n

(MATHEMATICS) → triangle m

(MUSIC) → triangle m

Collins English/French Electronic Resource. © HarperCollins Publishers 2005

triangle

n → Dreieck nt; (= set square) → (Zeichen)dreieck nt; (Mus) → Triangel m; (fig: = relationship) → Dreiecksbeziehung f

Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

triangle

[ˈtraɪˌæŋgl] n (Math, Mus) → triangolo

triangle

(ˈtraiӕŋgl) noun

1. a two-dimensional figure with three sides and three angles.

2. a musical instrument consisting of a triangular metal bar that is struck with a small hammer.

triˈangular (-gju-) adjective

in the shape of a triangle. a triangular road-sign; It is triangular in shape.

triangle

→ مُثَلَّث triangl, trojúhelník trekant, triangel Dreieck, Triangel τρίγωνο triángulo kolmio, triangeli triangle triangl, trokut triangolo トライアングル, 三角形 삼각형, 트라이앵글 driehoek, triangel trekant, triangel trójkąt triângulo треугольник triangel กิ๋ง เครื่องดนตรีรูปสามเหลี่ยม, สามเหลี่ยม üçgen hình tam giác, kẻng ba gốc 三角, 三角铁

tri·an·gle

n. triángulo.

Mentioned in

References in classic literature

We found that an imaginary line, drawn from the end of the wharf to a windmill farther along the shore, cut precisely in half the line of the triangle along which the Italians must escape to reach the land.

It happened that the Lancashire Queen, the shore at Turner's Shipyard, and the Solano Wharf were the corners of a big equilateral triangle. From ship to shore, the side of the triangle along which the Italians had to escape, was a distance equal to that from the Solano Wharf to the shore, the side of the triangle along which we had to travel to get to the shore before the Italians.

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The same thing would happen if you were to treat in the same way a Triangle, or Square, or any other figure cut out of pasteboard.

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Black on thy back is thy triangle and symbol; and I know also what is in thy soul.

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I had noticed that whenever I built a fire, Ajor outlined in the air before her with a forefinger an isosceles triangle, and that she did the same in the morning when she first viewed the sun.

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As the geometrician, when he is asked whether a certain triangle is capable being inscribed in a certain circle

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"It has been ready a long while," answered the marker, who had already set the balls in a triangle, and was knocking the red one about for his own diversion.

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It was already dark on the third day after the scene described in the previous chapter when we camped in some huts at the foot of the "Three Witches," as the triangle of mountains is called to which Solomon's Great Road runs.

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William rose, casting a tranquil glance over the enthusiastic crowd, and his keen eyes rested by turns on the three extremities of a triangle formed opposite to him by three persons of very different interests and feelings.

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The city forms an immense triangle marked out upon a vast plain of white sand, its acute angle directed toward the north and piercing a corner of the desert.

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The counterpane was of patchwork, full of odd little parti-colored squares and triangles; and this arm of his tattooed all over with an interminable Cretan labyrinth of a figure, no two parts of which were of one precise shade --owing I suppose to his keeping his arm at sea unmethodically in sun and shade, his shirt sleeves irregularly rolled up at various times --this same arm of his, I say, looked for all the world like a strip of that same patchwork quilt.

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Among others, to show the whimsicality of their deadly seriousness, may be mentioned the following: The Bleeding Hearts, Sons of the Morning, the Morning Stars, The Flamingoes, The Triple Triangles, The Three Bars, The Rubonics, The Vindicators, The Comanches, and the Erebusites.

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