Mathematics

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


SOLUTION
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.
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