Two angles 
and 
are said to be complementary if 
. In other words, 
and 
are complementary angles if they produce a right
angle when combined.
Complementary Angles
See also
Angle, Right Angle, Supplementary Angles Explore this topic in the MathWorld classroomExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Complementary Angles." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ComplementaryAngles.html