Complementarity is also a mathematical term to describe the relationship between two angles. If the sum of two angles is 180, the two angles are called "complementary" for short. If two angles are complementary, it can be said that one of them is the complement of the other.
Extended data:
If a and b are complementary angles, that is, a+b = 90, there is
( 1) sinA=cosB，cosA=sinB
(2) tanAtanB= 1 (tanA and tanB are not equal to 0)
(3) tanA = cotB
What should be paid attention to when they are complementary angles:
(1) "Complementary angle" is the quantitative relationship between two angles, regardless of their positions.
(2) The corners in the concept of "mutual redundancy" always appear in pairs.
(3) Only acute angles have complementary angles.