A cylinder has 2 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.
A cube has 6 flat faces
A flat square has 4 faces.
It has 5 flat faces because there are 4 flat faces at the top and 1 flat face at the bottom.
A cylinder has 2 flat, parallel faces.
A cylinder has 2 opposite parallel flat faces
There is no faces because it is not flat.
If you mean a tetrahedron then it is a triangular based pyramid with 4 flat faces
Six faces are flat.
a cube has six sides or faces
Two flat faces (one at either end of the prism), and a curved side.