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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 pipe entered through the end of the tunnel, threaded into a right-angle pipe fitting, and disappeared into the tunnel floor!

    The Blue Ghost Mystery Harold Leland Goodwin
  • Obtuse, an angle having a wider opening than a right-angle or "perpendicular."

    Stained Glass Work C. W. Whall
  • At length he rose and climbed on, presently turning at a right-angle to bisect the strip to its boundary before he paused to rest.

    The Valiants of Virginia Hallie Erminie Rives
  • At the epicentre, the angle of emergence is a right-angle; at a great distance from the epicentre, it is nearly zero.

  • That one side and one acute angle of a right-angle triangle determine the other sides of the triangle.

  • Its bole, five feet of stalwart diameter, rose straight and tapering to the first right-angle limbs, each in itself almost a tree.

    The Roof Tree Charles Neville Buck
  • Fig. 245 shows a form of right-angle cross which allows the trolley-wheels of crossing lines to pass.

    Things a Boy Should Know About Electricity Thomas M. (Thomas Matthew) St. John
  • The toe is never pointed in line with the leg, but held at a right-angle to it, as in the standing position.

    The Morris Book Cecil J. Sharp
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.
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