This is a right angle. There's also a word for two angles whose sum add up to 90 degrees, and that is complementary. These 2 angles (∠AOB and ∠AOC) are Complementary Angles, … Complementary angles definition is - two angles that add up to 90 degrees. Although a right angle is 90 degrees, but it can’t […] So it is very similar, complementary is ninety, supplementary is one eighty. So a hundred and five degrees is the supplement of what angle. 2 angles are Complementary when they add up to 90 o (a Right Angle).. By Mark Ryan . If the sum of two angles is 180 degrees then they are said to be supplementary angles, which forms a linear angle together.Whereas if the sum of two angles is 90 degrees, then they are said to be complementary angles, and they form a right angle together. And that is because their measures add up to 90 degrees. The measure of the larger angle is 10 degree more than thrice the measure of the smaller angle. The definition for supplementary angles is two angles that add to one eighty. Definitions, Postulates and Theorems Page 1 of 11 Name: Definitions Name Definition Visual Clue Complementary Angles Two angles whose measures have a sum of 90o Supplementary Angles Two angles whose measures have a sum of 180o Theorem A statement that can be proven Vertical Angles Two angles formed by intersecting lines and Example of Complementary Angles. Two angles are complementary. Complementary angles are two angles that add up to 90°, or a right angle; two supplementary angles add up to 180°, or a straight angle. Supplementary angles and complementary angles are defined with respect to the addition of two angles. Complementary angles are pair angles with the sum of 90 degrees. So we can also say that angles DBA and angles ABC are complementary. Complementary Angles are two acute angles that add up to give a right angle, 90°. The angle that is 92 degrees does not have a complement - since the complement would need to be negative 2 degrees, and negative angles are not allowed in the definition of complementary angles. Complementary angles are always in a pair. Definition Of Complementary Angles. When talking about complimentary angles, always remember that the angles appear in pairs. Find the measure of the smaller and larger angle in degrees. Complimentary Angles – Explanation & Examples What is a Complementary Angle? Complementary angles definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. One angle is the complement of the other angle. One angle is complementary to the other or One angle is the complement of the other. These angles aren’t the most exciting things in geometry, but you have to be able to spot them in a diagram and … 34°, 56° and 28°, 62° are examples of complementary angles. 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