Just call it a 250-sided shape, or a 250-sided polygon. It just isn't very useful to find complicated-sounding names for shapes of every number of sides, especially for a large numbers of sides.
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That shape is called a cylinder.That shape is called a cylinder.That shape is called a cylinder.That shape is called a cylinder.
a shape is called a shape in mathematics
A shape's sides are called faces.
A 10 sided shape is called a decagon
A nine sided shape is called a nonagon.