The only thing that can be said that there must be at least 4 faces and at least 6 edges and that the polyhedron must satisfy the Euler criterion which requires that:
Faces + Vertices = Edges + 2.
A 3D shape with 16 edges is a cuboctahedron. This polyhedron features 8 triangular faces and 6 square faces, resulting in a total of 16 edges. Another example is a truncated tetrahedron, which also has 16 edges. Both shapes are classified as Archimedean solids.
8 edges and 5 faces
If it is a polyhedron, then four or more faces and four or more corners.
The 3D shape with 12 edges is a dodecahedron. It is a polyhedron with 12 flat faces, each of which is a regular pentagon. When laid out flat, the dodecahedron can be represented as a net, which shows how the faces connect to form the three-dimensional shape.
cylinder
6 faces, 12 edges
The faces in a 3-D shape (polyhedron, for example) are bordered by edges.
A 3D shape with 16 edges is a cuboctahedron. This polyhedron features 8 triangular faces and 6 square faces, resulting in a total of 16 edges. Another example is a truncated tetrahedron, which also has 16 edges. Both shapes are classified as Archimedean solids.
8 edges and 5 faces
A polyhedron is any 3D solid (such as a cube) - therefore, it can have any number of faces.
If it is a polyhedron, then four or more faces and four or more corners.
A tetradecachedron is a polyhedron, also known as a 14-sided polyhedron or 14-faced polyhedron. It is a convex solid with 14 faces, 24 edges, and 14 vertices. The term "tetradecachedron" can refer to any 14-faced polyhedron, not necessarily a specific shape.
Actually, there is such thing as a polyhedron. Its a 3D shape and it's faces are all the same shapes. Doesn't matter what shape, actually. ^^^ ok, to the dude who answered before me (above): you're a butt... you didn't answer the freaking question! Its 6
The 3D shape with 12 edges is a dodecahedron. It is a polyhedron with 12 flat faces, each of which is a regular pentagon. When laid out flat, the dodecahedron can be represented as a net, which shows how the faces connect to form the three-dimensional shape.
cylinder
A 3D shape with 21 faces is called a "icosahedron" if it has 20 triangular faces, but if we consider a more general polyhedron with 21 faces, it can be referred to as a "polyhedron with 21 faces." There isn't a specific name for a polyhedron with exactly 21 faces, as many configurations can exist depending on the arrangement and types of faces. Generally, polyhedra are categorized by the number and types of faces they have.
The numbers in the question do not satisfy the Euler characteristic so there cannot be such a [convex] polyhedron.