: 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.
Recent Examples on the WebThe second triangle wall even boasts a window to inspire imaginative play.—Heather Balogh Rochfort, Parents, 18 May 2024 This week: • Uncovering a century-old love triangle.—Longreads, 17 May 2024 These sites formed a triangle around Lycée Jean Jacques Rousseau, the school in Saigon that Bùi Tường Phong attended that same year.—TIME, 16 May 2024 Colorado’s North Fork Valley consists of three main towns — Crawford, Hotchkiss and Paonia — that form a triangle on the Western Slope.—Jamie Siebrase, The Denver Post, 13 May 2024 See all Example Sentences for triangle
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'triangle.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Word History
Etymology
Middle English, from Anglo-French, from Latin triangulum, from neuter of triangulus triangular, from tri- + angulus angle
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