It has one.
2 flat surfaces unless it is rolled up in which case it has 2 curved surfaces.
distorted....
An empty cone (like an ice-cream cone) doesn't have any flat surfaces. It has two curved surfaces, one outside and one inside. A solid cone has a flat base, and one other curved surface.
Cylinder
A cylinder
A sphere has one continuous curved surface.
A cone has one curved surface.
It has one.
How about a cylinder, a cone and a sphere
One curved surface (two if it is hollow) and no edges.
sphere, cylinder, cone
A lune or biangle. For example, a segment of an orange, which has two plane surfaces and one curved one.
A cone has either one or two surfaces and either one or no edges.
One.One.One.One.
a hexagonal prism has 0 curved surfaces
2 flat and 1 curved