Sometimes. Actually, it is nearly always, but not quite.
They can be but not always because supplementary angles add up to 180 degrees.
In a parallelogram consecutive angles are always supplementary. This means they equal 180.
False :]
No. COMPLIMENTARY angles always add up to 90 degrees. SUPPLEMENTARY angles always add up to 180 degrees. you don't really have to know this stuff in later math, but for whatever course you're in right now it would be a vital error to mix them up. but if you are asking if every angle that is supplementary to another is 90 degrees by itself, the answer is still no. a supplementary can be any angle that is less than 180 degrees.
A supplementary angle is 180 degrees. So, it depends how many supplementary angles you add together.
Sometimes but not always.
Sometimes but not always depending on what type of polygon it is and supplementary angles add up to 180 degrees
Angles that add up to 180 degrees are always supplementary
Always :P
Supplementary angles are angles whose sum always equals 180 degrees.
Sometimes but not always depending on what type the 4 sided quadrilateral is.
The answer is yes, because supplementary angles are to angles that add up to 180.
Only when they add up to 180 degrees can they be supplementary angles.
They can be but not always because supplementary angles add up to 180 degrees.
No.
Two right angles would always be supplementary because the sum of their angles is 180 degrees.
They can be but not always because supplementary angles add up to 180 degrees.