12.Twelve: six at the top and six at the bottom.
12
10
A rectangular prism has 8 vertices.
2 more vertices
3 more vertices
Faces=5 edges=9 vertices=6
A pentagonal prism has: 7 faces 10 vertices 15 edges
5 faces, 6 vertices, and 9 edges.
Did you mean vertices? A rectangular prism would have 8 vertices.
A hexagonal prism has 8 faces, 18 edges, and 12 vertices.
There are 4 vertices's on a triangular prism