If you wish to communicate information, I suggest you call it an 50-gon. Not only is the use of long Greek prefices pretentious, you will only annoy the reader who will probably have to consult a dictionary.
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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 2d nine sided shape is called a nonagon.