# Definition:Angle/Adjacent

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## Definition

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

## 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:

Such **adjacent angles** are seen to be supplementary.