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supplementary angles

American  
[suhp-luh-men-tuh-ree ang-guhlz] / ˌsʌp ləˈmɛn tə ri ˈæŋ gəlz /

plural noun

  1. Geometry. a pair of angles whose sum is 180°.

supplementary angles Scientific  
/ sŭp′lə-mĕn′tə-rē /

  1. Two angles whose sum is 180°.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

It may be noted that ∠P2CP1, being made up of halves of two supplementary angles, is a right angle.

From Project Gutenberg

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.