a sphere
a sphere
One curved surface (two if it is hollow) and no edges.
a cone.
A curved surface is like imagining a sheet of paper that is bent or a flag waving in the wind. A curved edge is like an elastic stick bent in one(C curve) or more points(S curve). The curved surface beeing 3 dimensional(3D) and the curved edge 2 dimensional(2D) unlike the simple surface and edge which are 2D respectively 1D.
A cone. A hemisphere.
cone
A cone.
A Cylinder
A shape with one vertex, one edge, and two faces is called a cone. The vertex is the point where the edges meet, the edge is the line where the faces meet, and the faces are the flat surfaces of the shape. In the case of a cone, one face is the circular base and the other face is the curved surface.
You are probably thinking of the Moebius strip.
A cylinder has two bases that are both circles, as well as one lateral rectangle (surface) that is between the two circles and curved around their edge to form a cylinder.