: 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 third and final side of the triangle is a cruise along the A16 Highway through bucolic countryside to Vilnius.—Joe Yogerst, Forbes.com, 22 Apr. 2025 What does the future hold in this interesting triangle?—Ronda Racha Penrice, HollywoodReporter, 17 Apr. 2025 Related Articles The event is aimed at promoting the Celine summer collection, which includes raffia baskets, small leather goods, ready-to-wear, accessories and lifestyle items featuring French summery decorative elements such as a triangle bag carrying three metal Pétanque balls.—Tianwei Zhang, Footwear News, 10 Apr. 2025 The swimsuit featured gold chain-link details connecting the triangle top and in place of where strings would go for the bikini's bottom.—Starr Bowenbank, People.com, 10 Apr. 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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