I would call it a 181-gon. Keep it simple! Not only is the use of long Greek prefices pretentious, you will only annoy the reader who will probably have to consult a dictionary.
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A twelve sided polygon is called a dodecagon.
Some examples are: 5 sided polygon is a pentagon, 6 sided polygon is an hexagon and an 8 sided polygon is an octagon
None!!!! A 7-sided polygon is named 'HEPTAGON'., However, An 8-sided polygon is named 'OCTAGON'.
If the seven sides are all the same length , then it is a regular polygon. A seven sided polygon is named a 'HEPTAGON'. If the seven sides are regular then it can be named as a ' Regular Heptagon'.
Well, it is all in personal opinion, but the funniest named polygon would be the 'nonagon' (non-uh-gon), which is a nine-sided polygon.