Definition:Adjacent


 * Adjacent (Graph Theory):
 * Two vertices are said to be adjacent if there exists an edge to which they are both incident.
 * Two faces of a planar graph are said to be adjacent or neighboring if there exists an edge to which they are both incident.


 * Adjacent (Geometry):
 * Two angles are adjacent if they share a line. Similarly:
 * The two sides of a polygon that form a particular vertex are adjacent to that vertex.
 * The two vertices of a polygon that terminate a particular side are adjacent to that side.
 * Two sides of a polygon that meet at the same vertex are adjacent to each other.


 * Adjacent (in a Triangle): The two sides of a triangle that form a particular vertex are adjacent to that vertex. Usually used in the context of right triangles.