Go to related link below for pictures of polygons.
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There are many places where you can find a picture of a polygon. If you go to Google and type in polygon pictures of polygons will pop up.
A 20-sided polygon is an icosagon.(see related link)
A 57-sided polygon would be called a pentacontaheptagon.(see related link for naming)
A polygon is a closed shape bounded by only straight lines. The distance around a polygon is called the Perimeter The actual distance of the polygon depends on the shape. See related links below for a website I believe will help you.
An icosikaidigon is a 22-sided polygon. For names of polygons see http://mathforum.org/dr.math/faq/faq.polygon.names.html