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# right angle

noun
1.
the angle formed by two radii of a circle that are drawn to the extremities of an arc equal to one quarter of the circle; the angle formed by two perpendicular lines that intersect; an angle of 90°.
Origin
1350-1400
1350-1400; Middle English
Related forms
right-angled, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for right angle
• The right colic flexure is situated in the upper and right angle of intersection of the subcostal and right lateral lines.
• Intersection crash data indicates signalized intersections have a high number of right angle and head-on left turn crashes.
• If the referee is in the right position with the right angle, he has a much better chance to make the right call.
• Rotate it through a right angle, or a multiple of a right angle, and it is indistinguishable from its unrotated self.
• When you get closer, you see that each horizontal section is made up of two pieces that converge in a right angle.
• And talk about gentlemen: at the end of a song, they bowed deeply, almost to a right angle.
• These may be observed at any time of day if you are oriented at the right angle so that the reflections can occur.
• Start with two straight runs with a right angle turn in between them.
British Dictionary definitions for right angle

## right angle

noun
1.
the angle between two radii of a circle that cut off on the circumference an arc equal in length to one quarter of the circumference; an angle of 90° or π/2 radians
2.
at right angles, perpendicular or perpendicularly
related
adjective orthogonal
Derived Forms
right-angled, adjective
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
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right angle in Science
 right angle   (rīt)    An angle having a measure of 90°.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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right angle in Culture

### right angle definition

An angle measuring ninety degrees, formed by the intersection of two perpendicular lines. (Compare acute angle and obtuse 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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### Difficulty index for right angle

Few English speakers likely know this word

### Word Value for right

9
9
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