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Concept

Adjacent Angles

Two angles are adjacent angles if they meet the following conditions.

They share a common side.
They share a common vertex.
They do not overlap.

The diagram illustrates an example of adjacent angles.

Two adjacent acute angles, angle BOA and angle COB. The measure of angle BOA is represented by alpha and the measure of angle COB is represented by beta.

Angle $α$ and angle $β$ share the vertex $O$ and the side $O B,$ with no overlapping region.

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