In order to be 3D it must have a length, a width, and a height.
EDIT: Mobius Strip
Spherical
Cone
A cone perhaps?
Sphere, torus, moebius strip
A 3D shape with one curved face is a cylinder. It has a circular base and a curved surface that connects the two bases. The curved face wraps around the side, while the top and bottom faces are flat circles.
Its an Cylinder
Spherical
Sphere
A cone?
A cone.
Cone
hemisphere
A cone perhaps?
a cone
cone
cylinder
They both have a face, not a :) face but a side of a shape is called a face and a 2d and 3d shape both show a face of the shape