### Definition of Complementary angles

1. Noun. Two angles whose sum is a right angle.

Generic synonyms: Angle

### Definition of Complementary angles

1. Noun. (geometry) A pair of angles that sum to a right angle. ¹

¹ Source: wiktionary.com

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### Lexicographical Neighbors of Complementary Angles

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### Literary usage of Complementary angles

Below you will find example usage of this term as found in modern and/or classical literature:

1. Plane and Spherical Trigonometry: And Four-place Tables of Logarithms by William Anthony Granville (1909)
"Functions of complementary angles. To make our discussion complete we repeat the following from p. 3. Theorem. A function of an acute angle is equal to the ..."

2. Plane and Spherical Trigonometry by Arthur Graham Hall, Fred Goodrich Frink (1910)
"Functions of complementary angles. If, in Fig. 6, Z XOB is constructed equal to Z.AOY, XOB (=/8) and XOA (=«) are complementary. The triangles OM'P' and OMP ..."

3. Secondary Mathematics: I- by Harry Morton Keal, Nancy Seymour Phelps (1917)
"complementary angles 43 complementary angles: If the sum of two angles is a right angle or 90°, they are called complementary angles. ..."

4. Plane Trigonometry with Practical Applications by Leonard Eugene Dickson (1922)
"Relations between the functions of complementary angles. Two angles are called complementary if their sum is a right angle or 90°. ..."

5. First-year Mathematics for Secondary Schools by Ernst Rudolph Breslich (1915)
"complementary angles 182. complementary angles. Two angles whose sum is a right angle are complementary angles. Each angle is said to be the complement of ..."

6. General Mathematics by Raleigh Schorling, William David Reeve (1919)
"complementary angles. If the sum of two angles is a right angle, the two angles ... Draw two complementary angles of 40° and 50° and place them adjacent. ..."

7. Modern Junior Mathematics by Marie Gugle (1920)
"complementary angles 1. What is the sum of the two small angles of a right ... Any two angles whose sum is a right angle or 90° are complementary angles. ..."