The name of a 23 sided shape is an icosikaidigon.
I hate to tell you but this is not true the real answer is Icosikaitri....
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The name of a 12 sided polygon is Dodecagon.
A 8 sided polygon is called a octagon.
The name of a 9 sided polygon is Nonagon.
The name of a 19 sided polygon is enneadecagon.
The name of a 17 sided polygon is Heptadecagon.