A Centillion Sided polygon is called a Hipintigon. I say this because the very large illions are based on polygons. And because illion number 1 Hectillion is a Hipintillion, I used the way to turn polygons into illions and just reversed it. There you go!
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
A 12-sided polygon is called a dodecagon.
A 14 sided polygon is called a tetradecagon.
A 20-sided polygon is called an icosagon.
A million-sided polygon is called a megagon.
A 90-sided polygon is called an enneacontagon.
A five-sided polygon is called a pentagon.
A 13 sided polygon is called a Tridecagon also a Triskaidecagon.
what is a 50 sided polygon called?
2000 sided polygon
A 8 sided polygon is called a octagon.
A five-sided polygon is called a pentagon. A regular five-sided polygon is simply called a regular pentagon