There are 12 edges in 8 triplets of mutually perpendicular groups or 24 pairs.
One triplet = three pairs since the triplet since the triplet (x y z) is equivalent to the pairs (xy, yz and zx)
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A triangular prism has 9 edges!
A triangular based prism has 6 vertices and 9 edges.
There is no such shape as a perpendicular prism.
A triangular prism has 9 edges, 5 faces and 6 vertices
A triangular prism has 6 edges and so an octagonal prism will have 16 edges.