A polyhedron is any multi-faced solid. In order to know how many pairs, you need to know how many total faces.
There are 257 topologically different convex octahedra. Many of these will have no parallel faces. It can have four pairs of parallel faces.
none
its 2
Three pairs.
A spherical polyhedron is a dodecahedron with 12 faces
3 pairs of parallel faces
A cuboid has 3 pairs of parallel faces.
There are 257 topologically different convex octahedra. Many of these will have no parallel faces. It can have four pairs of parallel faces.
It can have one, two or three pairs of parallel faces.
3 pairs
Three.
3 pairs
Three pairs.
21
A triangular based pyramid has zero pairs of parallel faces. In a triangular based pyramid, all three faces of the base are not parallel to the apex, which means there are no pairs of parallel faces in this type of shape.
There are infinitely many such polyhedra. A regular dodecahedron, for example.
none