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One curved surface (two if it is hollow) and no edges.
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.
Yes.
A hemisphere is a half of a sphere, divided by a plane passing through its center. It has a flat base where the cut was made, while a sphere is a three-dimensional shape with no flat surfaces. The hemisphere has a curved surface area and volume that are half that of a full sphere.
The surface area of a polyhedron can be calculated by first calculating the area of each of its polygonal surfaces and adding these together.The surface area of some curved solids (sphere, cylinder, cone) can be calculated from formula but for most curved solids are more complicated and require integration.