no shape
A face value in maths is the out-side of the shape, as to say the face of a shape. The face value is the sides of a shape.
The side
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
There are many. Some of them are: sphere, ellipsoid, torus, and (to call it by its technical term) a blob.
Octagon .
A profile.
A sphere
A blob.
a line
A Moebus strip.
It is a face.