In a polyhedron - a 3-dimensional object - a pair of parallel faces are two faces which lie in planes that are parallel to each other.
Parallel faces need not be congruent. For example, consider a pyramid whose top is sliced off by a plane parallel to it base. The flat top and the base will be parallel faces but will not be congruent.
A cube has three pairs of parallel faces and all faces are congruent.
3 pairs of parallel faces
A cuboid has 3 pairs of parallel faces.
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.
Usually, a pair of parallel bases and four pairs of parallel lateral faces.
There are 257 topologically different convex octahedra. Many of these will have no parallel faces. It can have four pairs of parallel faces.
A cube.
A rhombus is 2-dimensional and does not have faces. It does have two pairs of parallel sides however.
It can have one, two or three pairs of parallel faces.
a cube * * * * * It cannot be a cube because a cube does not have 8 pairs of perpendicular faces - it has 12.
A cube has three pairs of parallel faces and all faces are congruent.
A hexagon