Placing a question mark at the end of a phrase does not make it a sensible question. Try to use a whole sentence to describe what it is that you want answered. The answer may be "polygon" but it is difficult to tell when the question is unclear.
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a polygon is a multi-sided shape, therefore a circle is not a polygon.
multi sided shapes are called polygons
The name for a 57 sided shape is derived by combining the name for a 50 sided shape with the name for a 7 sided shape. A 57 sided shape is called a pentacontaheptagon.
A 999 sided shape is simply known as a 999 sided shape.
A nonagon is a nine sided shape.