: 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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Those imprisoned under that code were forced to wear a pink triangle to denote homosexuality.—Ashley MacKin Solomon, San Diego Union-Tribune, 30 June 2025 This is good news for Hyun-ju, Yu-ri, and Geum-ja, who, between them, happen to have a key for each of the three shapes of locks (circle, triangle, and square, of course).—Jennifer Zhan, Vulture, 27 June 2025 Goicoechea paired the two-piece triangle top swimsuit with a gold body chain and a black swim cap.—Ingrid Vasquez, People.com, 26 June 2025 Decades-long family drama unfolds, confidences are betrayed, love is rekindled (and triangles formed), affairs are revealed, mysteries are solved, land disputes collide, and we are all left on the edge of our couches wanting to find out just what happens next.—Abigail Wilt, Southern Living, 26 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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