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complementary angles

Scientific  
/ kŏm′plə-mĕn′tə-rē /

  1. Two angles whose sum is 90°.

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“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 ...

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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.