octadecagon or octakaidecagon
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If you say this shape is 18 sided i would guess it has 18 sides. ;)
A regular hexagon that has a perimeter of 18 units of measurement
The definition a triangle is that it has three sides and if it had any more or less it would become another shape. So, no.
A shape with 9 sides, is a nonagon.
the shape with the most sides is unknown