Question

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

• A. vertically opposite angles
• B. opposite interior angles
• C. corresponding angles
• D. adjacent pair angles

Answer 1

The correct option is A vertically opposite angles

$\angle AOC$ and $\angle BOD$ are equal and vertically opposite angles.
$\angle AOD$ and $\angle BOC$ are equal and vertically opposite angles.
Thus, the pairs of angles are vertically opposite.