In the definition of [regular polygon](https://en.wikipedia.org/wiki/Regular_polygon) at the Wikipedia, there is this statement about the limit of a n-gon:

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> "In the limit, a sequence of regular polygons with an increasing number of sides becomes a circle, if the perimeter is fixed, or a regular apeirogon, if the edge length is fixed."
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My question is:

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> I am trying to understand how to imagine an [apeirogon](https://en.wikipedia.org/wiki/Apeirogon) versus a circle, but that definition (regarding edge length) and the visual representation found in the Wikipedia or Wolfram is not very clear to me.
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Indeed looking for information in other websites, I found also something called "[infinigon](http://math.wikia.com/wiki/Apeirogon)", but it seems that there is not formal definition (or I did not find it).

This topic could be very basic but I did not find former questions at MSE, and I am interested in understand the difference. Thank you!