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View synonyms for triangle

triangle

[ trahy-ang-guhl ]

noun

  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, especially one in which two of them are in love with the third.
  7. Triangle, Astronomy. the constellation Triangulum.


triangle

/ ˈtraɪˌæŋɡəl /

noun

  1. 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: 1 2 base × height
  2. any object shaped like a triangle
  3. any situation involving three parties or points of view See also eternal triangle
  4. 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
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


triangle

/ trīăng′gəl /

  1. A closed geometric figure consisting of three sides.


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Derived Forms

  • ˈtriˌangled, adjective
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Other Words From

  • triangled adjective
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Word History and Origins

Origin of triangle1

First recorded in 1350–1400; Middle English, from Latin triangulum, noun use of neuter of triangulus “three-cornered”, tri-, angle 1
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Word History and Origins

Origin of triangle1

C14: from Latin triangulum (noun), from triangulus (adjective), from tri- + angulus corner
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Idioms and Phrases

see eternal triangle .
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Example Sentences

For example, you can change drawing A into drawing B by flipping the triangle made by nodes 1, 2 and 3 over the edge connecting nodes 2 and 3.

A triangle with sides of all different lengths is “scalene,” or “unequal.”

There is the classic triangle, a sturdy square, and you may even see some rectangular shapes if you are dealing with a nice flatbread.

For the four Platonic solids built out of squares or equilateral triangles — the cube, tetrahedron, octahedron and icosahedron — mathematicians recently figured out that the answer is no.

Like the triangle and the quadrilateral, the N-gon with the maximum area was a regular N-gon, with equal side lengths and angles.

This Texas Triangle now has the same population as the entire State of Florida.

The scorned party in a love-triangle, he blew his head off while serving overnight tower duty in 2007.

For her first film, she played a woman caught in a love triangle between a nightclub owner and a country boy.

We kept joking about the show evolving and blossoming from this love triangle into this five-pointed star.

In reading about ASHA, its current location is hard to overlook—Research Triangle, North Carolina.

On the other hand, the arrows along the sides of the triangle represent actual circulation.

He was a narrow-headed man with frail-looking sloped shoulders and a thin triangle of face.

There are sixty thousand acres of mighty good spruce in that triangle between us, and it's as good as ours.

(e) No part of the counter shall intersect a triangle or the produced perpendicular thereof shown on p. 186.

A third game was called trign, and was played by three persons, stationed at the angles of an equilateral triangle.

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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Triandatriangle inequality