Can I find the number of sides of a polygon without using interior angle?

Question

Can I just use one exterior angle to find the number of sides? Sorry if that was too basic trying to understand polygons and sides/ angles relations

Edit: regular polygons

Answer 1

No. One exterior (or equivalently, interior) angle is certainly not enough. If you happen to pick the right angle of a right triangle, you cannot distinguish that from a rectangle.

Answer 2

Definitely not. However if you were given a regular polygon then $360/$exterior angle will probably give you the required answer to your question.