An 8-sided plane figure is an octagon.
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A two-dimensional figure is a polygon. The eight sides means that it uses the prefix octa- (meaning eight) to form the name octagon.
A quadrilateral is a closed plane figure with four straight sides.
A expample of a plane figure with 6 sides and 6 vertices is called a hexagon. hex means 6.
It is a dodecagon
A polygon