either of two angles that added together produce an angle of 90°.
“Compliment” vs. “Complement”: How To Pick The Right WordCompliment and complement are commonly confused terms because they're pronounced alike and originally shared some meanings ...
Compare supplementary angle.
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British Dictionary definitions for 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