There is something called a degenerate triangle; it has 3 sides as all triangles do, but one of them is of zero length, causing the triangle to collapse into a line segment. That would make it in effect a one sided polygon, however if you want to you can consider the line to have a top side and a bottom side (although they are really on top of each other and not distinguishable). So really, there is no two sided polygon.
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The name of a 22 sided polygon is Icosidigon.
The name of a 22 sided polygon is Icosidigon.
Using systematic polygon naming, a twenty-two sided polygon would be called an icosakaidigon.
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
An octagon is a two-dimensional polygon with eight sides which can be regular or irregular