a closed plane figure having three sides and three angles.
a flat triangular piece, usually of plastic, with straight edges, used in connection with a T square for drawing perpendicular lines, geometric figures, etc.
any three-cornered or three-sided figure, object, or piece: a triangle of land.
a musical percussion instrument that consists of a steel triangle, open at one corner, that is struck with a steel rod.
a group of three; triad.
a situation involving three persons, especially one in which two of them are in love with the third.
Triangle, Astronomy. the constellation Triangulum.
- triangled, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use triangle in a sentence
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 New Algorithm for Graph Crossings, Hiding in Plain Sight | Stephanie DeMarco | September 15, 2020 | Quanta Magazine
A triangle with sides of all different lengths is “scalene,” or “unequal.”Why Mathematicians Should Stop Naming Things After Each Other - Issue 89: The Dark Side | Laura Ball | September 2, 2020 | Nautilus
There is the classic triangle, a sturdy square, and you may even see some rectangular shapes if you are dealing with a nice flatbread.Pizza cutters that will get you the slice of your dreams | PopSci Commerce Team | September 2, 2020 | Popular-Science
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.Mathematicians Report New Discovery About the Dodecahedron | Erica Klarreich | August 31, 2020 | Quanta Magazine
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.Kerry Washington’s Favorite ‘Scandal’ Season 3 Moments | Kerry Washington | August 8, 2014 | THE DAILY BEAST
In reading about ASHA, its current location is hard to overlook—Research triangle, North Carolina.STI Awareness Month Is Nothing More Than a Hallmark Holiday for Condoms | Kent Sepkowitz | April 18, 2014 | THE DAILY BEAST
On the other hand, the arrows along the sides of the triangle represent actual circulation.Readings in Money and Banking | Chester Arthur Phillips
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.Scattergood Baines | Clarence Budington Kelland
(e) No part of the counter shall intersect a triangle or the produced perpendicular thereof shown on p. 186.Yachting Vol. 2 | Various.
A third game was called trign, and was played by three persons, stationed at the angles of an equilateral triangle.The Private Life of the Romans | Harold Whetstone Johnston
British Dictionary definitions for triangle
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
any object shaped like a triangle
any situation involving three parties or points of view: See also eternal triangle
music a percussion instrument consisting of a sonorous metal bar bent into a triangular shape, beaten with a metal stick
a group of three
- triangled, adjective
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
Scientific definitions for triangle
A closed geometric figure consisting of three sides.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Other Idioms and Phrases with triangle
see eternal triangle.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.