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complementary angle

noun, Mathematics.
either of two angles that added together produce an angle of 90°. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for complementary angle

complementary angle

either of two angles whose sum is 90° Compare supplementary 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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