No.
No.
cuboid
eight * * * * * No! A cuboid, placed on a face has only 4 vertical edges.
if you have a 3d cuboid it is the smooth serface
A cuboid with an open top has 5 faces. A cuboid has 6 faces in total, and when the top is open, one face is removed. The remaining faces include the front, back, left, right, and bottom of the cuboid.
No.
Yes.
Rectangle.
No.
cuboid
Each face of a cuboid is just as special as any of the other faces.
eight * * * * * No! A cuboid, placed on a face has only 4 vertical edges.
4 on each face.
if you have a 3d cuboid it is the smooth serface
Yes but its length is rectangular
A cuboid has rotational symmetries of order 2 around each of the three axes going through a pair of opposite faces.