The answer depends on whether you wish to communicate with your readers and help them or if you wish to be an unhelpful smarta$$. In the first case I would suggest that you call a 23 sided polygon a 23-gon. Otherwise, you may wish to follow the link.
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That will depend on what x represents which has not been given.
Unless the area is a regular polygon (or a circle) you cannot.
they came from how many sides are on the polygon
Then the point is not outside the polygon...?
icosagon