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A plane figure with eight sides is an octagon.
regular polygon-all the sides are the same length and the angles have the same measurement. polygon-a closed plane figure whose sides are segments that intersect at their endpoints.
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.