A two sided polygon is called a bigon, and it exists in spherical geometry.
(the previous answerer said this: "a polygon has 3 or more sides retard idiot so how stupid can you be a polygon can not have 2 sides dumb*ss" - and I would advise him/her to shout at the mirror next time)
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
A million-sided polygon is called a megagon.
A 12-sided polygon is called a dodecagon.
A 20-sided polygon is called an icosagon.
A 90-sided polygon is called an enneacontagon.
There is no such thing as a two-sided polygon.
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
There aren't two sided polygons
A million-sided polygon is called a megagon.
A 12-sided polygon is called a dodecagon.
A 20-sided polygon is called an icosagon.
A 14 sided polygon is called a tetradecagon.
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