12.
There are 4 edges on one base, 4 edges on the other base, and 4 edges joining the 2 quadrilateral bases.
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A triangular prism has 9 edges!
A Pentagonal Prism has 15 edges.
A square prism has 12 edges.
The rectangular prism has 12 edges.
A triangular prism has 6 edges and so an octagonal prism will have 16 edges.