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complementary angles

American  
[kahm-pluh-men-tuh-ree ang-guhlz] / ˌkɑm pləˈmɛn tə ri ˈæŋ gəlz /

plural noun

  1. Geometry. a pair of angles whose sum is 90°.

complementary angles Scientific  
/ kŏm′plə-mĕn′tə-rē /

  1. Two angles whose sum is 90°.

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.

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 complementary angles is 55 degrees.

From Textbooks • Apr. 22, 2020

The difference of two complementary angles is 68 degrees.

From Textbooks • Apr. 22, 2020

For the following exercises, use cofunctions of complementary angles.

From Textbooks • Feb. 13, 2015

“Here we go,” Princeton says, as they begin a lesson on such concepts as parallel lines and complementary angles in the quiet coziness of the family’s suburban home ...

From "The World Is Flat" by Thomas L. Friedman

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.