Do supplementary angles still apply for non 90 degree angles?

I think you might be confused...

"Supplementary" angles are two angles which sum to 180 degrees.

Thus.........a supplementary angle could be the sum of two 90 degree angles.......but it might also be the sum of an acute angle (less than 90 degrees) and an obtuse angle (greater than 90 degrees)...thus a 30 degree angle and a 150 degree angle would sum to 180 degrees.