Two or zero. A cuboid can have 6 rectangular faces; or 4 rectangular faces with 2 square faces on either end
6 everybody knows that
An octagon doesn't have any faces: faces only apply to 3-dimensional objects. If you meant edges, or sides, an octagon has eight. If you meant an octagonal prism, they have ten faces.
2 faces
6
A cuboid has 8 vertices, 12 edges and 6 faces
Two or zero. A cuboid can have 6 rectangular faces; or 4 rectangular faces with 2 square faces on either end
6 everybody knows that
An octahedron has8 faces, 12 to 18 edges and 6 to 12 edges.
A cube has 6 sides, and so does a cuboid.
a rectangular based pyramid has got 6 edges and four faces and four vertices.
2 faces 1 edge
Pentagonal (not pentaginal). 7 faces 15 edges 10 vertices
12 faces * * * * * Correct as far as it goes, but incomplete. 20 vertices 30 edges
a hexagon has one face and 6 edges a hexagonal pyramid has 7 faces a hexagonal prism has 8 faces
It has 24 edges, so now you can count its number of sides.
A cuboid has got six flat surfaces.