12.
There are 4 edges on one base, 4 edges on the other base, and 4 edges joining the 2 quadrilateral bases.
A solid shape with 8 edges is known as a quadrilateral prism or a square prism, which has 8 edges in total (4 from the top face and 4 from the bottom face). Additionally, a triangular prism also has 9 edges, but it does not fit the criteria. Thus, the primary solid shape with exactly 8 edges is the square prism.
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 quadrilateral prism has 12 edges, 8 vertices and 6 faces.
A quadrilateral-based prism.
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 square prism has 12 edges.
A Pentagonal Prism has 15 edges.
The rectangular prism has 12 edges.
A triangular prism has 6 edges and so an octagonal prism will have 16 edges.
A hexagonal prism has 18 edges.
There is no such shape. A tetrahedron has 6 edges, but it is NOT a prism.