A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges.
15 edges
A pyramid with an n-sided base will have n + 1 vertices. 6 of them.
A triangular prism has 9 edges!
There are 30 edges on a decagonal prism.
A heptagonal prism has 20 edges.
A rectangular Prism has 12 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.
There are twelve edges in a rectangular prism.
A triangular prism has 9 edges.
A hexagonal prism has 18 edges.