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supplementary angle

American

noun

Mathematics.

either of two angles that added together produce an angle of 180°.

supplementary angle British

noun

either of two angles whose sum is 180° Compare complementary angle

"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

Etymology

Origin of supplementary angle

First recorded in 1830–40

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