One.
One.
One.
One.
There is 1 curved surface on a sphere
A sphere has one continuous curved surface.
One curved surface (two if it is hollow) and no edges.
It is curved
How about a cylinder, a cone and a sphere
sphere, cylinder, cone
A cone, cylinder and a sphere are three examples.
Sphere, ellipsoid, torus, paraboloid, hyperboloid are shapes with only curved surfaces. Hemisphere, quadrant, cone and cylinder are examples of shapes with curved and plane surfaces. There are, of course, many others.
One if it is solid, two if it is hollow
2 flat and 1 curved
5
A cone has one curved surface.