Definition:Angle/Adjacent

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Definition

Two angles are adjacent if they have an intersecting line in common:

AdjacentAngles.png


Also defined as

Some sources give that adjacent angles are the angles on a straight line at the intersection of that line and another.


Under such a definition, $\angle \alpha$ and $\angle \beta$ are adjacent in the diagram below:


AdjacentAngles-alsoDefinedAs.png


Such adjacent angles are seen to be supplementary.