An illustration shows five rays with points near the arrows labeled A,B,C,D, and E in a counterclockwise direction, emerging from a common point labeled O. The points A,O, and E fall on a straight line. All the four angles are marked but unlabeled.
Which angles are adjacent to angle DOC?
A. Angle DOB
B. Angle EOD and angle COB
C. Angle AOD
D. Angle AOB and angle EOA
The angles adjacent to angle DOC are angle DOB and angle COB.
Explanation: Adjacent angles are angles that share a common side and a common vertex. In this case, angle DOC shares a common side (DO) and a common vertex (O) with both angle DOB and angle COB. Therefore, both angle DOB and angle COB are adjacent to angle DOC.