A shape with 18 edges is called an 18-gon or an 18-sided polygon in two dimensions. In three dimensions, a polyhedron with 18 edges could be a specific type of structure, such as a triangular prism with additional faces or other complex polyhedral forms. An example of a polyhedron with exactly 18 edges is the truncated tetrahedron. The characteristics of such shapes can vary widely depending on the arrangement and number of vertices and faces.
Octagon
A hexagonal prism.
An hexagonal cross-section prism has 8 faces, 18 edges and 12 vertices
It is octagonal prism
An octagonal pyramid
Two polyhedrons have 18 edges: truncated tetrahedron and hexagonal prism.
a shape that has 9 faces
there are none
Octagon
A hexagonal prism.
A hexagonal prism
An hexagonal cross-section prism has 8 faces, 18 edges and 12 vertices
It is octagonal prism
An octagonal pyramid
Hexagonal Prism
corn
the shape that has 8 faces , 18 edges , and 12 vertices is simply a hexagonal prism not a pyramid my butt :P