There are 9 edges.
It has three edges which are parallel to each other (along the length of the prism) AND it has three pairs of parallel edges - at the top and bottom of the prism.
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A triangular prism has 9 edges!
A triangular based prism has 6 vertices and 9 edges.
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.
6 edges.