Divide the shapes, so you're left with a triangular prism, and a rectangular prism. Calculate the slope of the triangle as per usual.
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The pitch of the roof.
One difference: An octahedron has 8 faces, a triangular prism has 5. An octahedron (="eight faces") is a regular high-symmetry solid with all the faces identical. A triangular prism has a triangular base, a triangular roof, and 3 rectangular sides (walls).
a roof
The roof of your House
It is most often expressed as a ratio of inches of rise per 12 inches of run. A roof slope that rises 4 inches for every 12 inches of run is a "4 in 12" slope, or 4/12 slope, or 4:12 slope.