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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.
Each of the nine edges have another edge running parallel to them.
A triangular prism has 9 edges!
A triangular prism has 9 parallel lines
A triangular based prism has 6 vertices and 9 edges.