Math ATube.com
 .
Complementary Angles
Two angles are called complementary angles if the sum of their degree
measurements equals
90 degrees. One of the complementary angle is
said to be the complement of the other.
 Example:
These two angles (40° and 50°) are Complementary
Angles, because they add up to
90°.
 Example:
These two angles (25° and 65°) are Complementary
Angles, because they add up to
90°.
Notice that together they make a right angle.
27+ 63 = 90
25 + 65 = 90
(By the way,complementary angles do not necessarilly have to be adjacent angles. In other words,
complementary angles do not have to be side-by-side. The only requirement to be complementary
angles is adding up to 90°.)
Angles    > Complementary & Supplementary Angles < you are here
 .
.......................................................................................................................................................................................
Example of a
Supplementary angles
45+135=180
 .

Supplementary Angles are two
angles that add up to 180 degrees.