A polyhedron is a simply connected 3-dimensional shape whose faces are all regular polygons. A hexagonal pyramid is a special case in which one face is a hexagon and six faces are triangles.
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A hexagonal pyramid.
A hexagonal cylinder is an impossible object. If you meant a hexagonal prism then it is a polyhedron.
A hexagonal cylinder is an impossible object. If you meant a hexagonal prism then it is a polyhedron.
There are many possibilities. Some of them are: A nonagon-based pyramid. A hexagonal prism. A hexagonal dipyramid (two hexagon-based pyramids stuck together on their bases).
A hexagonal prism is a polyhedron. Many hexagonal prisms are polyhedra.