: a percussion instrument consisting of a rod of steel bent into the form of a triangle open at one angle and sounded by striking with a small metal rod
b
: a drafting instrument consisting of a thin flat right-angled triangle of wood or plastic with acute angles of 45 degrees or of 30 degrees and 60 degrees
3
: a situation in which one member of a couple is involved in a love affair with a third person
Illustration of triangle
1 equilateral
2 acute
3 obtuse
4 scalene
5 isosceles
6 right triangle
Examples of triangle in a Sentence
She cut the sandwiches into triangles.
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That was a hugely disappointing team performance by Parkinson’s side but the passing triangle between Cleworth, Dobson and Longman remained strong.—Richard Sutcliffe, New York Times, 9 Oct. 2025 Season 9 began with the first batch of episodes last week introducing six couples who got engaged in the pods after several love triangles, love squares, and at least one shocking ghosting.—Sydney Bucksbaum, Entertainment Weekly, 7 Oct. 2025 Sector heavyweight NextEra Energy (NEE) is breaking out from a multi-year triangle pattern in a bullish long-term development.—Katie Stockton, CNBC, 6 Oct. 2025 Another way to wear a silk scarf is to wrap it around your hips in a triangle and knot it at the side.—Nils Doose, Glamour, 5 Oct. 2025 See All Example Sentences for triangle
Word History
Etymology
Middle English, from Anglo-French, from Latin triangulum, from neuter of triangulus triangular, from tri- + angulus angle
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