Any two angles whose measures add up to 180 degrees. For example, opposite angles of a cyclic quadrilateral (quadrilateral whose vertices are on a circle).
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They are called a linear pair.
Adjacent. And if the adjacent angles are supplementary (add up to be 180o), then it's a linear pair.
Every pair of supplementary angles includes one obtuse angle?
Yes if they are right angles
They are called linear pair, because their farthest sides lie on the same line.Any two angles that add to 180 degrees are called supplementary angles.