any quadrilateral... square,rectangle, rhombus...
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Basically, the meaning of a polygon is closed because the sides are straight. A meaning of a polygon for you: a square. A square has 4 sides that are all straight, a square is a polygon.
square
a closed figure with 4 sidesA square or any shape with 4 lateral sides.
a Rhombus...
A hexagon is a closed 2-dimensional shape bounded by six straight sides. It has six vertices and its interior angles sum to 4*pi radians (720 degrees).