A semicircle
A sphere would fit the given description
a sphere has no bases and it only has one curved surface
A circle or a sphere.
Curved surface area includes the area of the length of the cylinder only whereas surface area includes the two bases as well...
A semicircle
I am not sure that such a surface can exist.
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Spheres and spheroids have.Wait ! Don't go away. Any solid of revolution generated bya plane figure with only curves will have only a curved surface.
A sphere would fit the given description
Because that is how a polyhedron is defined.
The tetrahedron has only four faces. A sphere has only one, but that's probably not what you meant since the surface of a sphere is curved.
a sphere has no bases and it only has one curved surface
a sphere
A circle or a sphere.
An ellipsoid or a toroid or other 3-dimensional objects with more than one "holes". Or simply a ... sphere.
Yes, but not on a plane surface; only on a curved surface.