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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
1565-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for vertical angles
Historical Examples
  • vertical angles were always measured in both directions with the exception of the above-mentioned cases.

  • 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
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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