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
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.
It's called a mobius strip.