Question

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

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

Answer 1

The correct option is C

vertically opposite angles

In the figure below, lines AB and CD intersect each other at point O. Angles ( $\angle$AOD, $\angle$COB) and ( $\angle$AOC, $\angle$BOD) are called vertically opposite angles.

$\angle$AOC = $\angle$BOD [vertically opposite angles]

And, $\angle$AOD = $\angle$BOC [vertically opposite angles]