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Anonymous
The name of a 18 sided figure is an octadecagon or octakaidecagon. As you can see the prefix octa- means 8, and deca- means 10. It has 18 sides and 18 vertices,
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A 5-sided figure is called a pentagon.
The name of a 18 sided polygon is Octadecagon.
icosagon
Pentagon.
An octagon