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right angle

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; Middle English
Related forms
right-angled, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for right angle
Contemporary Examples
Historical Examples
  • The tenon ends are cut on the rails, care being taken to get the right angle and a good fit.

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

    The Hindered Hand 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.

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

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

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

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

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

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

    Prince Zaleski M.P. Shiel
British Dictionary definitions for right angle

right angle

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
at right angles, perpendicular or perpendicularly
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
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.
Cite This Source

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