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
Constructed from Alexander Graham Bell’s simple tetrahedron cell, the Cygnet model consists of two equilateral paper triangles, connected and illuminated by a hidden light source.
—
Sofia Celeste, Footwear News, 10 Apr. 2025
Your best chance is at the Casio triangle, the chicane between 130R and the final corner that leads onto the start-finish straight.
—ArsTechnica, 7 Apr. 2025
Their love triangle, with Boyd caught between Harrison and guitarist Eric Clapton, is also one for the ages.
—Anna Cafolla, Vogue, 3 Apr. 2025
The series follows an ongoing love triangle between Belly (Lola Tung) and brothers Conrad (Christopher Briney) and Jeremiah (Gavin Casalegno), whose families vacation together every summer in Cousins Beach, Mass.
—Kelsie Gibson, People.com, 31 Mar. 2025
See All Example Sentences for triangle
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Sofia Celeste, Footwear News, 10 Apr. 2025
Your best chance is at the Casio triangle, the chicane between 130R and the final corner that leads onto the start-finish straight.
—ArsTechnica, 7 Apr. 2025
Their love triangle, with Boyd caught between Harrison and guitarist Eric Clapton, is also one for the ages.
—Anna Cafolla, Vogue, 3 Apr. 2025
The series follows an ongoing love triangle between Belly (Lola Tung) and brothers Conrad (Christopher Briney) and Jeremiah (Gavin Casalegno), whose families vacation together every summer in Cousins Beach, Mass.
—Kelsie Gibson, People.com, 31 Mar. 2025
See All Example Sentences for triangle
Cite this Entry
“Triangle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triangle. Accessed 15 Apr. 2025.
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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