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vertical angle

noun, Geometry.
one of two opposite and equal angles formed by the intersection of two lines.
Origin of vertical angle
First recorded in 1565-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for vertical angles
Historical Examples
  • He does not see why vertical angles should be proved equal when he knows that they are so by looking at the figure.

    The Teaching of Geometry David Eugene Smith
  • The pupil who cannot see the equality of vertical angles intuitively better than by the use of the protractor is abnormal.

    The Teaching of Geometry David Eugene Smith
  • vertical angles were always measured in both directions with the exception of the above-mentioned cases.

British Dictionary definitions for vertical angles

vertical angles

plural noun
(geometry) the pair of equal angles between a pair of intersecting lines; opposite angles Also called vertically opposite angles
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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vertical angles in Science
vertical angles
Two angles formed by two intersecting lines and lying on opposite sides of the point of intersection.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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