Answered

Adjacent, right angles are complementary.

.always

.sometimes

.or never?? ...?

Verified Answer :

MissPhiladelphia

The best answer for this is sometimes. It is because any two angles which sum up to 90 degrees are complementary, which is either adjacent or separate.  An example for this are angles which have 40 degrees and 50 degrees respectively, which adds up to 90 degrees.