WRONG: A 3-d object needs 6 faces for it to look like a 3-d figure
Actually the answer is "at least four" - not six. Consider a regular tetrahedron, which is a pyramid with a triangular base. It has four planar faces.
An octagonal prism.
a cube
a piramid
Rectangular prism
a pyramid
A cylinder.
A pyramid.
a rectangular prism
Technically it is impossible for a 3d figure to have 3 faces. The least amount of faces that are possible is four.
12, if you mean a dodecahedron, a 3-d figure with only pentagonal faces.
A hexagonal pyramid.
a pyramid