It is quite acceptable to call it a 512-agon but what's more important is knowing how to work out its properties.
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a 4 sided shape is called a quadrilateral
== == A 56 sided shape is called a Pentacontakaihexagon.
A 600-sided shape is a hexcosiagon.
A twelve sided shape is a dodecagon.
A five sided 3d shape is called a pentehedron