polygons
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A polygon is a closed plane figure consisting of straight lines. So a square is a polygon, a pentagon is a polygon. Just draw any closed figure with straight lines and you have a polygon.
If they are straight lines then it is a polygon.
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.
Any closed figure that is not entirely composed of straight sides, such as an ellipse or a circle.
If they are straight sides, then a polygon. Otherwise, simply "a closed plane figure with 3 or more sides".