What 3d shape has 13 faces?

Answer 1

There are several 3d shapes with 13 faces:

I suspect that, out of all convex shapes where all edges have the same length (i.e., all faces are regular polygons), there are only 3 that have 13 faces:

* a 11-sided prism

* Gyroelongated square pyramid -- a Johnson solid

* Biaugmented pentagonal prism -- a Johnson solid

There are a huge number of 3d shapes with 13 irregular faces, including:

* Dodecahedron with one edge filed down to create another flat polygonal face

* Cube with 7-sided prismatic hole punched through it

* Cube with one 4-sided prismatic hole and one (non-intersecting) 3-sided prismatic hole punched through it

* ... etc.