Well, the prism that you're talking about is an octagonal. If you look at the relationship between the number of vertices, you see that there's a pattern. If you have six vertices, you subtract one to get the number of faces. From there, you would add four to get your edges. With 8 vertices, you'd do the same thing except that instead of subtracting just one, you'd subtract two for the number of faces, then add not four but six to get your edges. For ten vertices, you'd subtract three for the faces and add eight for the edges. To find the other information, you either calculate backwards (which I totally think you can do with the info. i gave you) or draw a 3D figure net to pictorially explain the problem. Hope this helped!
There are 30 edges on a decagonal prism.
A heptagonal prism has 20 edges.
A rectangular Prism has 12 edges.
A rectangular prism has 12 edges.
A pyramid with 18 edges would be called a nonagonal pyramid. A prism with 18 edges is called a hexagonal prism.
An octagonal prism has 10 faces, 24 edges and 24 edges(!) Oh, and in case you are interested, 16 vertices.
An octagonal prism has: 10 faces 16 vertices and 24 edges :)
24
triangle
24.
A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges. 24 edges
An octagonal prism has: 10 faces 16 vertices and 24 edges :)
24
Triangular prism
10 faces, 16 vertices, and 24 edges
Faces: 10 Vertices: 16 Edges: 24
Faces: 10 Vertices: 16 Edges: 24