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It could be a pyramid.
Because polyhedron means 'many faces' - a polygon is a two-dimensional shape - it only has one face.
A square is a 2-dimensional object. It has only one face and four sides.A square is a 2-dimensional object. It has only one face and four sides.A square is a 2-dimensional object. It has only one face and four sides.A square is a 2-dimensional object. It has only one face and four sides.
A polygon must be a 2-dimensional object so it cannot have any thickness (such as a sheet of paper), not can it have any curvature. So a picture on your TV screen - but only if it is a flat screen - is likely to be one of the few true examples.
A polygon is a 2-dimensional figure bounded by three or more straight lines. Any one of its sides may be considered a base.