Spherical
Cone
A cone perhaps?
Sphere, torus, moebius strip
In order to be 3D it must have a length, a width, and a height. EDIT: Mobius Strip
Its an Cylinder
Spherical
There cannot be such a shape. It is not a cylinder because a cylinder sdoes not have a rectangular face. A rectangle must be a flat face and the only flat faces in a cylinder are the circle faces. The curved face can be "opened out" into a rectangular shape but because the face is curved it cannot be rectangular.
Sphere
A cone?
A cone.
Cone
hemisphere
A cone perhaps?
a cone
cone
cylinder