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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.

In the next example, we remember that the measures of supplementary angles add to 180.

From Textbooks • May 6, 2020

We will need to add complementary angles and supplementary angles to our list some properties of angles.

From Textbooks • May 6, 2020

The difference of two supplementary angles is 58 degrees.

From Textbooks • Apr. 22, 2020

The difference of two supplementary angles is 24 degrees.

From Textbooks • Apr. 22, 2020

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

From The Teaching of Geometry by Smith, David Eugene

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.