It is a polygon that is a closed plane figure with 3 or more straight lines.
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a figure, esp. a closed plane figure, having three or more, usually straight, sides.
A polygon must be a plane, closed figure bounded by straight lines.
It is a 2-dimensional (plane) figure that is closed and which is bounded by straight lines.
A polygon is any closed plane figure bounded by three or more straight sides.
A polygon.