What is a 50 sided polygon called?

Hi Jenny:

A fifty-sided polygon is called a "pentacontagon". 

For more information about these figures, see:

Title: Pentacontagon - Wikipedia
URL: http://en.wikipedia.org/wiki/Pentacontagon

Title: Polygon Names
URL: http://www.math.com/tables/geometry/polygons.htm#names

Search Strategy (on Google):
* polygons "fifty sided"
* pentacontagon

I hope this helps. 

websearcher