: 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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No, not the Detroit Lions quarterback (although, hi), but the actor now playing one-third of a love triangle in Netflix's The Life List.—Maureen Lee Lenker, EW.com, 29 Mar. 2025 For starters, the triangle and square must have equal areas because the pieces are the same.—Lyndie Chiou, Scientific American, 27 Mar. 2025 What started out as a perfect trifecta of toxic positivity has evolved into something of a hate triangle.—Dan Heching, CNN, 24 Mar. 2025 Try these fun miniature-sized ideas: Sandwich: With a sharp knife, cut little triangles of bread, lunch meat, and lettuce, then stack them.—Kimberly Stoney, Parents, 19 Mar. 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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