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Supplementary angles add up to 180 degrees
Obtuse angles are greater than 90 degrees but less than 180 degrees. Straight angles are exactly 180 degrees. Reflex angles are greater that 180 degrees.
In basic Euclidean geometry no, the sum of the angles always equals 180 degrees exactly. In non-Euclidean geometry it can exceed 180 degrees.
If they're less than 180 degrees, they're obtuse angles. If more than 180 degrees, they're reflex angles. (Exactly 180 degrees is a 'straight' angle.)
No. They can only be exactly 180 degrees. By definition, a linear pair is a pair of two adjacent supplementary angles, so together they must form exactly 180 degrees.