adjacent angles

American

plural noun

Geometry.

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

adjacent angles British

plural noun

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

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adjacent angles

"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 Charlotte Mary Yonge

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

From Emile by Jean-Jacques Rousseau

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