# right triangle

## noun

: a triangle having a right angle

## Examples of right triangle in a Sentence

Recent Examples on the Web For example, Pythagorean triples (such as 3, 4 and 5), represent right triangles whose three vertices are all integer distances apart. Quanta Magazine, 1 Apr. 2024 Billiard tables shaped like acute and right triangles have periodic trajectories. Quanta Magazine, 15 Feb. 2024 In the early 1990s, Fred Holt at the University of Washington and Gregory Galperin and his collaborators at Moscow State University independently showed that every right triangle has periodic orbits. Quanta Magazine, 15 Feb. 2024 The space is also composed of simple geometric forms: two terraces and a patio are shaped like half circles, and rooms in one wing end on the 45-degree angles of right triangles, giving pointed views. Adriane Quinlan, Curbed, 22 Aug. 2023 Leo’s hindquarters are marked by a right triangle, whose eastern apex is marked by the star Denebola. Geoff Chester, Washington Post, 1 June 2023 These functions, such as the sine and cosine, are defined using right triangles. Leila Sloman, Scientific American, 10 Apr. 2023 Simply stated as a2 + b2 = c2, the theorem posits that the sum of the two shortest sides of a right triangle (a2 and b2) is equal to that triangle’s longest side (c2). Darren Orf, Popular Mechanics, 31 Mar. 2023 In this equation, a, b and c represent the lengths of the three sides of a right triangle, a triangle with a 90-degree angle between two of its sides. Leila Sloman, Scientific American, 10 Apr. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'right triangle.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

## Word History

First Known Use

1675, in the meaning defined above

Time Traveler
The first known use of right triangle was in 1675

right triangle

## Cite this Entry

“Right triangle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/right%20triangle. Accessed 23 Jul. 2024.

## Kids Definition

right triangle

noun
: a triangle having a right angle

## More from Merriam-Webster on right triangle

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