A one sided shape
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If you say this shape is 18 sided i would guess it has 18 sides. ;)
I'd say its a hexagon. Six-sided.
nontagon, or you can just say polygon
It depends on whether you want your readers to know what you are talking about or would rather be pretentious. I would say 97-gon.
all you have to do is multiply the two biggest sides and you get your answer. Ex: Lets say you had a shape with a 5 6 7 3 5 2 3 and the 5 and 3 were the biggest sides that connect you would then multiple them and your answer would be 35! WALAH!