There are 9 edges in a (triangular) prism.
Other prisms have different number of edges.
It depends upon the cross-sectional shape of the prism.
If n is the number of sides to the cross-sectional shape of the prism, the number of edges is 3n.
A triangular prism has 3x3 = 9 edges
A rectangular prism (cuboid) has 3 x 4 = 12 edges
etc
There are 30 edges on a decagonal prism.
A heptagonal prism has 20 edges.
A rectangular Prism has 12 edges.
12 edges.
8 edges
There are 30 edges on a decagonal prism.
A heptagonal prism has 20 edges.
A rectangular Prism has 12 edges.
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 triangular prism has 6 edges and so an octagonal prism will have 16 edges.
A triangular prism has 9 edges.
A hexagonal prism has 18 edges.
There is no such shape. A tetrahedron has 6 edges, but it is NOT a prism.
There are twelve edges in a rectangular prism.