No, but the faces of a polyhendron are all flat.
If you mean polyhedron - it is solid figure having many faces
There are many. All polyhedra have ONLY flat faces but many other shapes have flat faces such as a hemisphere or an octant or a cylinder.
Yes and its flat surface faces are in regular shapes.
Yes
A polyhedron is a 3-dimensional shape with MANY, but UNSPECIFIED number of vertices. The number of edges and faces are therefore not specified either. Poly = many Hedron = Vertex
None. All faces on a pyramid are flat.
A cube.
A polyhedron.
Yes.
It is a definitional requirement. If any face is not flat, then it is not a polyhedron.
All the faces of a triangular prism must be flat. So finding them should not be too difficult!
A pyramid has 4 flat faces, all of which are triangular. Don't confuse this with a square-based pyramid like those in Egypt, as they have 5 faces.