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The formal name is hectaicosikaihenagon. Most people, including mathematicians, will use 121-gon since that effectively communicates the size of the polygon. But, if you want to appear pretentious or be obfuscatory, by all means use the Greek prefices.

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9y ago

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A 121-sided shape is a polygon if it is a plane figure and a polyhedron if it is a solid (3-dimensional) figure.

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7y ago
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hectaicosikaihenagon

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Q: What is a 121 sided shape called?
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