That will depend on what they are but in general 3D shapes have surface area and volume whereas 2D shapes have only surface area.
It depends on the 3d shape.
It is not a 3D shape.
A camera is a 3D shape. A photograph is a 2D projection of a 3D shape onto a 2D shape.
a pyramid is a 3D shape :)
what 3d shape is a tyre
is a square a 3d shape
Paper is a 3D object.
2d
A heptagon is not a 3D shape. It is a seven sided shape. It could be designed on 3D software if necessary.
A shape in 3D is a polygon. Poly=many and gon=shape.
Many 3d shapes have a corner.
A 3d shape can have infinite sides