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a 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).
Divide the shapes, so you're left with a triangular prism, and a rectangular prism. Calculate the slope of the triangle as per usual.
A block of cheese,house roof,a ten,A paper boat
An A-Frame