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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 of right angle
1350-1400
Middle English word dating back to 1350-1400
Related forms
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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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
• Fruit often reddish, small, with the wings at about a right angle.

Austin C. Apgar
• Acute: pointed: terminating in or forming less than a right angle.

John. B. Smith
• But this log was going down at a right angle to the bank instead of parallel to it.

William Macleod Raine
• Concluding that he now had the pistol at the right angle, he pulled the trigger.

Sutton E. Griggs
• An obtuse angle is an oblique angle greater then a right angle.

Peter Ramus
• For right lines perpendicular are the makers of a right angle, as is manifest by the 13.

Peter Ramus
• As in the triangle aei: For they are both equall to one right angle, by the 13.

Peter Ramus
• A right angle is a parallelogramme that hath all his angles right angles.

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

Peter Ramus
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 New Dictionary of Cultural Literacy, Third Edition