3 pairs
Three.
21
A cuboid has 3 pairs of parallel faces.
Three.
the cuboid has 2
Three pairs.
3 pairs
3 pairs
Three.
21
A cuboid has 3 pairs of parallel faces.
Three.
4
7
A cuboid has 6 faces, 12 edges and 8 vertices which all meet at right angles.
Each lateral face is perpendicular to its lateral neighbours so that makes 4 pairs. In addition, opposite lateral faces may be perpendicular, making 6 pairs in all.