12!
square-based prism = rectangular prism.
rectangular prism = 4 + 4 + 4
4+4+4=12
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A square prism has 12 edges.
A triangular prism has 6 edges and so an octagonal prism will have 16 edges.
5 faces 5 vertices 8 edges
A triangular based prism has 6 vertices and 9 edges.
9 edges