# right angle

## right angle

noun
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; Middle English

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
 right angle —n 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: orthogonal 'right-angled —adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
 right angle   (rīt)  Pronunciation Key  An angle having a measure of 90°.
The American Heritage® Science Dictionary
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American Heritage
Cultural Dictionary

### 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
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Example sentences
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.
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