Illustration of triangle
- 1 equilateral
- 2 acute
- 3 obtuse
- 4 scalene
- 5 isosceles
- 6 right triangle
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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
Constructing any old irregular triangle with a compass and straightedge is child’s play—just scatter three points on the page and connect them with lines.
—
Jack Murtagh, Scientific American, 12 Sep. 2024
In the middle of a love triangle between a moon man and a female alien, Carpenter pushed the space traveler into the crowd before pulling the extra-terrestrial in for a passionate kiss.
—Dave Quinn, Peoplemag, 12 Sep. 2024
When both begin vying for her hesitant affections in their respectively charmless ways, a classic love triangle ensues.
—Vogue, 10 Sep. 2024
Though the carrozza also is tempting — the brioche buffalo mozzarella sandwich is coated and fried to crisp perfection, with each triangle standing upright on a pool of Parmesan fonduta and topped with truffle shavings.
—Jennifer Kester, Forbes, 5 Sep. 2024
See all Example Sentences for triangle 
Jack Murtagh, Scientific American, 12 Sep. 2024
In the middle of a love triangle between a moon man and a female alien, Carpenter pushed the space traveler into the crowd before pulling the extra-terrestrial in for a passionate kiss.
—Dave Quinn, Peoplemag, 12 Sep. 2024
When both begin vying for her hesitant affections in their respectively charmless ways, a classic love triangle ensues.
—Vogue, 10 Sep. 2024
Though the carrozza also is tempting — the brioche buffalo mozzarella sandwich is coated and fried to crisp perfection, with each triangle standing upright on a pool of Parmesan fonduta and topped with truffle shavings.
—Jennifer Kester, Forbes, 5 Sep. 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.
Dictionary Entries Near triangle
triandrous
triangle
triangle crab
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Cite this Entry
“Triangle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triangle. Accessed 22 Sep. 2024.
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Kids 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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