Question

Name all the pairs of vertically opposite angles in the following figure.

Answer 1

For intersecting lines $AC$ and $BD$ ,

$\angle AOB$ and $\angle DOC$ are vertically opposite angles.

For intersecting lines $AC$ and $PQ$ ,

$\angle AOP$ and $\angle QOC$ are vertically opposite angles.

For intersecting lines $PQ$ and $BD$ ,

$\angle POB$ and $\angle DOQ$ are vertically opposite angles.