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adjacent angles

American  

plural noun

Geometry.

  1. two angles having the same vertex and having a common side between them.

adjacent angles British  

plural noun

  1. two angles that have the same vertex and a side in common

"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

Example Sentences

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"Therefore, if the two sides of two triangles be equal to one another, and the adjacent angles be equal each to each," resounded through the laurels, as the walking party returned.

From The Stokesley Secret by Yonge, Charlotte Mary

To prove that two adjacent angles are equal to two right angles people describe a circle.

From Emile by Rousseau, Jean-Jacques

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.