Octagon
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If you say this shape is 18 sided i would guess it has 18 sides. ;)
The name of a 18 sided polygon is Octadecagon.
The interior angles of an 18 sided polygon add up to 2880 degrees
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
A hexagonal prism.