A pyramid with 18 edges would be called a nonagonal pyramid. A prism with 18 edges is called a hexagonal prism.
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They are all polyhedra with 12 edges.
It could be a pentagonal pyramid, but there are other possible shapes.
A hexagonal prism has eighteen edges. Hexagonal prisms also have twelve vertices and eight faces, including two hexagonal bases and six rectangular faces.
Five faced pyramid have 10 edges.Above is the answer for a pentagonal prism it has six faces (the bottom is also a face with five of the edges)A rectangular pyramid with five faces (four triangles and one rectangle) has eight edges.
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