The faces of a cube are all the same shape - a square.
a triangular pyramid.
A regular tetrahedron (triangular pyramid).
3d shape Well actually it is a Cube
A square I think.
A cube prism.
I think Its a Sphere
All 12 sides are straight! This is a 2 dimensional object. * * * * * A dodecahedron is NOT a 2 dimensional object so the above answer is utter nonsense. A dodecahedron has pentagonal faces.
A tetrahedron, an octahedron or an icosahedron,
Octagon. * * * * * An octagon is 2-dimensional. The regular 3-d shape (all faces the same) is the octahedron, but a hexagonal prism also has 8 faces.