9 edges
A rectangular prism has 12 edges. This can be understood by noting that it has 4 edges on the top face, 4 edges on the bottom face, and 4 vertical edges connecting the top and bottom faces.
15 edges.
12
Rectangular prism - 8 Rectangular pyramid - 5 8-5 = 3 Answer: 3
8
8
A triangular prism has 9 edges, 5 faces and 6 vertices
3 more
6 faces
3 more vertices
A triangular prism has 9 edges and 5 faces. It also has 6 vertices. A cube has 6 faces and 12 edges.
A hexagonal prism has 8 faces, 18 edges, and 12 vertices.