It is a 2-dimensional (plane) figure that is closed and which is bounded by straight lines.
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It means a shape of many sides.
Because an heptagon is a 7 sided shape and the word polygon means many sides.
It means two dimensional such as the shape of a polygon or a rectangle that has dimensions of length and width.
A six sided polygon means a two demensional shape with six sides. For example a hexagon has 6 sides and a hexagon is a two demensional polygon. CHAPTERDUCK
Because polyhedron means 'many faces' - a polygon is a two-dimensional shape - it only has one face.