sphere
don't no
no shape
a face
One side of a face in a 3D shape refers to a flat surface that forms part of the outer boundary of a three-dimensional object. In geometric terms, this is often called a "face," which can be a polygon like a triangle or rectangle. For example, in a cube, each side of the cube is a face, and there are six such faces in total. Each face contributes to the overall shape and volume of the 3D object.
The shape that has one side of a face is a "cone." A cone has a circular base and a pointed top, resulting in one curved surface and one flat face. It can be visualized as a three-dimensional object that tapers smoothly from the base to the apex.
don't no
no shape
A sphere
a line
A blob.
A Moebus strip.
It is a face.
Circle. Sphere.
Mobius strip
An edge.
a face
To answer this question more details need to be provided. For example one a 3D shape one side is called a face.