Yes
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a polyhedron * * * * * That is only if it is bounded by plane faces. A sphere, for example, is a three dimensional shape but is not a polyhedron: it is a solid shape.
No.A sphere is a three dimensional object whereas a circle is a two dimensional shape
No but a sphere is
Something that is not flat. A cube is three-dimensional, but a square is not. A sphere is three-dimensional, but a circle is not.
The answer is a sphere.