there cannot be a one sided polygon as a polygon is defined as a 2-dimentional shape, which has area, and is enclosed by straight sides. Thus a polygon must have at least 3 sides so that it can enclose an area. Perhaps the question is supposed to be more along the lines of what 2-dimentional shape has only one side? this would be a circle
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A 1 sided polygon exists as in my thought is a closed oval with a smooth surface all the way around between its width sort of like your closed eye shut and there exists so does maybe a 0 and non sided polygon, A 2 sided polygon is called a diagon. ref. Wikipedia.
The name of a 21 sided polygon is Icosihenagon.
A one-thousand sided polygon is called a chiliagon.
Yes a one-hundred sided polygon is called a Hectogon.Alot of people includeing myself has gotten it twisted with a Haptagon which is a seven sided polygon.
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon