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i would think it is south
One.
No. By definition a polyhedron has to have faces (flat surfaces), edges, and vertices. A sphere, hemisphere, and a cylinder are all solids but are not polyhedra.
no they don't have solid surfaces their surfaces are composed of gaseous material
A parallelepiped has 6 faces.
cube There are a great many solid shapes that have only flat surfaces.
Venus and Mercury also have solid surfaces.
There are 18 diagonals which are not on the surfaces of the prism.
A hemisphere, a cone.
A prism
A cone
the flat surfaces of a solid figure are the