it if called a edge for a 3D shape
A cone has either one or two surfaces and either one or no edges.
A cone.
A Cylinder
A cone.
it if called a edge for a 3D shape
A cone has either one or two surfaces and either one or no edges.
A cone.
A Cylinder
A cone.
One curved surface (two if it is hollow) and no edges.
The edge formed by two surfaces meeting each other is called a "corner" or a "boundary."
Cone
The edge of a shape can be considered a point where two sides meet to either form an angle (inside) or edge (outside).
They form a line or edge.
A cone would fit the given description
Conventionally, two faces, one edge and one vertex.