vertical angle

noun Geometry.
one of two opposite and equal angles formed by the intersection of two lines.

Origin:
1565–75

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
vertical angles
 
pl n
geometry Also called: vertically opposite angles the pair of equal angles between a pair of intersecting lines; opposite angles

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
vertical angles   (vûr'tĭ-kəl)  Pronunciation Key 
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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Example sentences
For measurements on the slope the vertical angles are determined by use of a
  clinometer or a transit.
Vertical angles tend to be in compression while diagonal angles tend to be in
  tension.
Elevation differences were determined by measuring vertical angles.
Using what they know about vertical angles and tracing paper, find the other
  angles.
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