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
How to use vertical angles in a sentence
When much accuracy is not required vertical angles can be measured by means of a quadrant of simple construction.Getting Gold | J. C. F. Johnson
vertical angles were always measured in both directions with the exception of the above-mentioned cases.The Andes of Southern Peru | Isaiah Bowman
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
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
Scientific definitions for vertical angles
Two angles formed by two intersecting lines and lying on opposite sides of the point of intersection.
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