A circle is not a 3D figure because it only has two dimensions. A sphere is a 3D "circle".
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A polyhedran is a 3-dimentional figure that has sides that are polygons. A polygon is a 2-dimentional figure with straight sides, a closed side.
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A two dimentional figure has two dementions.
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It's any figure that you can draw on a flat piece of paper or carve into your desktop.