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supplementary angle

noun, Mathematics.
either of two angles that added together produce an angle of 180°.
Origin of supplementary angle
First recorded in 1830-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Historical Examples
  • It may be noted that ∠P2CP1, being made up of halves of two supplementary angles, is a right angle.

    The Teaching of Geometry David Eugene Smith
British Dictionary definitions for supplementary angles

supplementary angle

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
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supplementary angles in Science
supplementary angles
Two angles whose sum is 180°.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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