An 11-sided figure is a hendecagon, or an undecagon. Either name applies.
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A plane figure with eight sides is an octagon.
If they are straight sides, then a polygon. Otherwise, simply "a closed plane figure with 3 or more sides".
hendecagon
I guess it is a dice or what else is it supposed to be? A hexagon is a plane figure with 6 sides.
A polygon is a plane figure with 3 or more straight sides and angles. A plane figure is a flat enclosed figure made of straight lines, curved lines, or both.