Illustration of triangle
- 1 equilateral
- 2 acute
- 3 obtuse
- 4 scalene
- 5 isosceles
- 6 right triangle
triangle
noun
tri·an·gle
ˈtrī-ˌaŋ-gəl 
1
: a polygon having three sides compare spherical triangle
2
a
: 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
Examples of triangle in a Sentence
She cut the sandwiches into triangles.
Recent Examples on the Web
As time starts running out, emotions intensify, resulting in a love triangle with life and death stakes.
—
Alex Ritman, Variety, 19 Nov. 2024
Shapes—circles, triangles, rectangles—are hand-painted in acrylic across strands, emerging near each works’ center.
—Maximilíano Durón, ARTnews.com, 25 Oct. 2024
The story goes: More than 50 years ago, two men — Rollin King and Herb Kelleher — walked into a bar in San Antonio and drew a simple triangle on a cocktail napkin.
—Ashlyn Robinette, People.com, 24 Oct. 2024
As time starts running out, emotions intensify, resulting in a love triangle with life-and-death stakes.
—Matt Grobar, Deadline, 19 Nov. 2024
See all Example Sentences for triangle 
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Alex Ritman, Variety, 19 Nov. 2024
Shapes—circles, triangles, rectangles—are hand-painted in acrylic across strands, emerging near each works’ center.
—Maximilíano Durón, ARTnews.com, 25 Oct. 2024
The story goes: More than 50 years ago, two men — Rollin King and Herb Kelleher — walked into a bar in San Antonio and drew a simple triangle on a cocktail napkin.
—Ashlyn Robinette, People.com, 24 Oct. 2024
As time starts running out, emotions intensify, resulting in a love triangle with life-and-death stakes.
—Matt Grobar, Deadline, 19 Nov. 2024
See all Example Sentences for triangle
Dictionary Entries Near triangle
Cite this Entry
“Triangle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triangle. Accessed 28 Nov. 2024.
Copy CitationKids Definition
triangle
noun
tri·an·gle
ˈtrī-ˌaŋ-gəl
1
: a figure that has three sides and three angles : a polygon that has three sides
2
: a percussion instrument made of a steel rod bent into a triangle open at one corner which is played by striking with a metal rod
3
: a drafting instrument consisting of a thin flat right-angled triangle
Medical Definition
triangle
noun
tri·an·gle
ˈtrī-ˌaŋ-gəl
: a three-sided region or space and especially an anatomical one see anterior triangle, carotid triangle, femoral triangle, posterior triangle, suboccipital triangle
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