A right angle.
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Adjacent
Yes, as for example 78 degrees and 102 degrees would form a supplementary angle of 180 degrees.
Any angle that is supplementary is also adjacent. Two examples of a set of adjacent, supplementary angles are: 89 degrees and 91 degrees; or 100 degrees and 80 degrees.
No? Wouldn't they then be supplementary? Opposite rays make a straight angle/line, and if the exterior sides made the straight angle, the adjacent angles would be supplementary. ...Right?
All supplementary angles would be linear pairs IF they were adjacent. But they could be far apart.