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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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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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hectaicosikaihenagon

Q: What is a 121 sided shape called?

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it is called a seven sided shape in Canada

An five sided shape is called a Pentagon

a 69 sided shape is called a sexagon

A 90 sided shape is called Enneacontagon.

A 128-sided shape is called a hecatoicosioctagon.

Related questions

it is called a seven sided shape in Canada

a one sided shape is called a henagon and a 2 sided shape is called a digon

A 10-sided shape is called a decagon.

An five sided shape is called a Pentagon

a 69 sided shape is called a sexagon

A 90 sided shape is called Enneacontagon.

A 35 sided shape is called a triacontakaipentagon

A 150 sided shape is called heptaconta.

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The 22 sided shape is called a: ICOSIKAIDIGON

A five-sided shape is called a pentagon.

A 128-sided shape is called a hecatoicosioctagon.