# right triangle

- a triangle having a right angle (contrasted with oblique triangle).

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## Origin of right triangle^{}

First recorded in 1920–25

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## right triangle

- US and Canadian a triangle one angle of which is a right angleAlso called (in Britain and certain other countries): right-angled triangle

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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## right triangle

- A triangle having a right angle.

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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

## right triangle

A triangle that contains a right angle.

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The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.