right triangle

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

Origin:
1920–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
right triangle
 
n
(US), (Canadian) Also called (in Britain and certain other countries): right-angled triangle a triangle one angle of which is a right angle

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
right triangle  
A triangle having a right angle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

right triangle definition


A triangle that contains a right angle.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The hypotenuse of a right triangle is not always the shortest distance between
  the two points that define it.
The cosine function is simply the ratio of the sides a and c in the diagram
  below of a right triangle.
Draw a right triangle with the given leg length on dot paper.
Students can do this, using the right triangle cutouts.
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