WordReference Random House Unabridged Dictionary of American English © 2026
com′plemen′tary an′gle, [Math.]
  1. Mathematicseither of two angles that added together produce an angle of 90°. Cf. supplementary angle.

Collins Concise English Dictionary © HarperCollins Publishers::
complementary angle n
  1. either of two angles whose sum is 90°
    Compare supplementary angle
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'complementary angle' also found in these entries (note: many are not synonyms or translations):
supplementary angle

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