A polyhedron is in a subclass of geometric solids. The difference is that a polyhedron must have flat faces and straight edges.
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A sphere is a geometric solid because it has 3 dimentions.
Octohedron, or diamond
polyhedron is often defined as a geometric object with flat faces and straight edges polygon is traditionally a plane figure that is bounded by a closed path or circuit, composed of a finite sequence of straight line segments (i.e., by a closed polygonal chain). .
No, because a polyhedron is a solid with many flat faces. A heptagon is not a 3-D figure. However, a pyramid or prism would be a polyhedron.
A Platonic solid?