plane shape
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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.
A 2 dimensional shape such as a circle is NOT a solid shape, while a sphere is.
Sphere
a circle!
It is a volume (3D) shape - "solid" has nothing to do with it.