There are 257 topologically different convex octahedra. Many of these will have no parallel faces. It can have four pairs of parallel faces.
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its 2
Three pairs.
A rectangular prism has three pairs of parallel lines. The top and bottom faces are parallel to each other, the front and back faces are parallel, and the two side faces are parallel. This makes a total of three pairs of parallel lines in a rectangular prism.
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
3 pairs
Three.
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.
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