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 of right angle
1350-1400
1350-1400; Middle English
Related forms
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for right angle
Contemporary Examples
• Love insisted the feathers be ruffled just enough, the eyes be at just the right angle.

Historical Examples
• The tenon ends are cut on the rails, care being taken to get the right angle and a good fit.

H. H. Windsor
• Concluding that he now had the pistol at the right angle, he pulled the trigger.

Sutton E. Griggs
• The trolley swung round at a right angle (up Avenue A) and the last block of 86th Street showed the benefit of this manoeuvre.

Christopher Morley
• And here hence you must understand by one right angle that all are right angles.

Peter Ramus
• Hemmed in from the fore and the rear, he swung off at a right angle.

William MacLeod Raine
• For the right angle at a, is equall to the opposite angle at i, by the 10 e x.

Peter Ramus
• Figure 105 represents two such pieces, one at a right angle to the other, both being of equal diameter.

Joshua Rose
• Because that which is in the opposite section, is lesser than a right angle.

Peter Ramus
• Some fibrillary twitchings at the right angle of the mouth have also arrested my attention.

M.P. Shiel
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
Derived Forms
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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
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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
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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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