A 27-sided shape is called a heptacosagon. The prefix "hepta-" denotes the number 7, while the suffix "-gon" indicates a polygon with that number of sides. Therefore, a heptacosagon is a polygon with 27 sides.
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No particular individual name is in common use. Not all plane shapes have a specific name, that would not be possible. The suffix used for many shapes is .....-agon. It is perfectly permissible to say a twentyseven-agon
It's quite acceptable to call it a 27-agon but what's more important is knowing how to work out its properties.
it is called a seven sided shape in Canada
A 90 sided shape is called Enneacontagon.
A 128-sided shape is called a hecatoicosioctagon.
An five sided shape is called a Pentagon
Most mathematicians would call that a "27-gon," but you could also use icosikaiheptagon.