Question

The vertex of ∠WON is

Answer 1

A vertex is a point where two or more curves, lines, or edges meet.

Using this information, perhaps you can solve the rest of the question that's there. If you would like to show us the details, we can help you further. :)

Answer 2

old question but will respond so this can be closed

in general, when an angle is written in <XXX form, the vertex is the middle point. you can confirm this by drawing <WON