Yes.
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Two adjacent angles are considered supplementary angles. They aggregate and make an angle that measures 180 degrees.
Two angles are adjacent if they have the same vertex, share a side and do not overlap. It is, therefore, perfectly possible for two obtuse angles to be adjacent. In fact, every pair of adjacent angles in a hexagonal tessellation (a honeycomb, for example), consists of a pair of obtuse angles (120 degrees).
They are called adjacent angles.
Adjacent. And if the adjacent angles are supplementary (add up to be 180o), then it's a linear pair.
They are adjacent and add up to 180 degrees.