pairs of angles sharing a common side and a common vertex

Two angles which share a common side and the same vertex.

two angles that share a vertex and a common side between them but have no interior points in common. ABC and CBD are adjacent.

Two angles in a plane that share a common side and share a common vertex but have no interior points in common (do not overlap).

Two angles that share a ray, thereby being directly next to each other.

Two coplanar angles with one common side and a common vertex, but no common interior points.

In geometry, adjacent angles are angles that have a ray coming out of the vertex going between two other rays