Adjacent sides any two sides with a common endpoint(vertex)are called the adjacent sides of the polygon.

Adjacent sides and Opposite sides

Adjacent sides two sides of a quadrilateral are called its adjacent sides if they have a common endpoint.

Adjacent sides two sides of a quadrilateral are called its adjacent sides if they have a common endpoint.

Draw an octagon ABCDEFGH and name all the sides, adjacent sides and vertices as well as the diagonals of the polygon.

Diagonal joins any two adjacent vertices of a polygon .

Adjacent angles two angles of a quadrilateral are called adjacent angles if they have a common side as arm.

Adjacent angles two angles of a quadrilateral are called adjacent angles if they have a common side as an arm.