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An eighteen sided shape is called a Octadecagon, or a Octakaidecagon.
Provided we are talking about a 2D figure with straight sides, it is an octadecagon.
The name of a 18 sided polygon is Octadecagon.
An octadecagon is an 18 sided polygon.
octadecagon is the name of a 2 d 18 sided polygon. The octa part is for 8 and the deca is for 10 since 18=10+8