No.
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A polygon is a flat figure, like a square. A polyhedron is a 3D figure, like a cube.
A polyhedron.
A circle is one example of a plane figure that is not a polygon. A V is also not a polygon.
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.
Do you mean a polygon? A polygon is a two-dimensional figure.