vertical angles

vertical angle

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

Origin:
1565–75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Vertical angles is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a chattering or flighty, light-headed person.
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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