12
12
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There are 30 edges on a decagonal prism.
A heptagonal prism has 20 edges.
A rectangular Prism has 12 edges.
A triangular prism has a triangular base. A square-based prism has a square base. A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges.
12 edges.