: 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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The numbers that identify various types of plastic are surrounded by a triangle of arrows that would seem to indicate they can be recycled.—Doug Ross, Chicago Tribune, 21 June 2025 That side still used the team's triangle passing attack but added an occasional long ball or medium pass to open up the defense.—Michael Lewis, Forbes.com, 20 June 2025 This love triangle honestly stinks and is somewhat stale.—Taryn Finley, Refinery29, 17 June 2025 The first bikini photo of the post featured Lovato wearing a bright orange, three-piece swimsuit consisting of a triangle swim top, high-waisted cheeky bottom and matching sarong.—Starr Bowenbank, People.com, 17 June 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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