For polygons with large numbers of sides then just use the number as 250-gon, although it helps to state whether its a regular polygon or irregular.
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Decagon. A decagon is the name of a ten sided shape.
A 10-sided shape is a decagon.
A Pentacontagon is a fifty sided shape ...
hundred sided shape is called a chlligon
A 70 sided shape is called a heptacontagon.