If lines AB and CD intersect each other at point O, then ∠AOD and∠COB are angles.
In the figure below, lines AB and CD intersect each other at point O. Angles (∠ AOD, ∠ COB) and (∠ AOC, ∠ BOD) are called ___.
In the figure below, lines AB and CD intersect each other at point O. The angle pairs ( ∠AOD and ∠COB) and ( ∠AOC and ∠BOD) are called ___.