triangle

American  

[trahy-ang-guhl] / ˈtraɪˌæŋ gəl /

noun

1. a closed plane figure having three sides and three angles.

2. a flat triangular piece, usually of plastic, with straight edges, used in connection with a T square for drawing perpendicular lines, geometric figures, etc.

3. any three-cornered or three-sided figure, object, or piece.

   a triangle of land.

4. a musical percussion instrument that consists of a steel triangle, open at one corner, that is struck with a steel rod.

5. a group of three; triad.

6. a situation involving three persons, especially one in which two of them are in love with the third.

7. Astronomy. Triangle, the constellation Triangulum.

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triangle British  

/ ˈtraɪˌæŋɡəl /

noun

1. geometry a three-sided polygon that can be classified by angle, as in an acute triangle, or by side, as in an equilateral triangle. Sum of interior angles: 180°; area: 1/ 2 base × height

2. any object shaped like a triangle

3. any situation involving three parties or points of view See also eternal triangle

4. music a percussion instrument consisting of a sonorous metal bar bent into a triangular shape, beaten with a metal stick

5. a group of three

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triangle Scientific  

/ trī′ăng′gəl /

1. A closed geometric figure consisting of three sides.

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triangle Idioms  

1. see eternal triangle.

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Other Word Forms

• triangled adjective

Etymology

Origin of triangle

First recorded in 1350–1400; Middle English, from Latin triangulum, noun use of neuter of triangulus “three-cornered”, tri-, angle ¹

Example Sentences

The sloped ceiling gives the room the appearance of a triangle.

From Literature

Church & Dwight CHD 0.52%increase; green up pointing triangle posted sales growth in the fourth quarter as an increase in personal care product sales offset a decline in revenue from household products.

From The Wall Street Journal

Canadian National Railway CNR 1.85%increase; green up pointing triangle reported higher profit and revenue for the fourth quarter thanks to better freight volumes and improved operational efficiency.

From The Wall Street Journal

Air Products APD 0.05%increase; green up pointing triangle and Chemicals logged higher profit and revenue in its fiscal first quarter, boosted in part by higher prices that stemmed from increased energy costs.

From The Wall Street Journal

Western Digital WDC -0.46%decrease; red down pointing triangle logged higher profit and sales in its latest quarter, boosted by the growth of artificial intelligence.

From The Wall Street Journal

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