A sphere.
An hemisphere is half of a globe with a circular flat base, a round edge, a curved surface but no vertices.
It has a flat base, a curved surface area, a circular edge and one vertex.
Such a shape probably does not have a specific name.
how many flat surfCES does a cylinder have?
a sphere has 0 flat serfaces 0 vertices
Hemisphere
a cone
Cone
Technically, there's no shape with no surface and no vertices, but a sphere is close. It has no vertices but has just one surface.
cylinder?
sphere
0 vertices 0edges 2 flat surfaces
Hemisphere
This is an impossibility. If it is a solid figure then it will have more than 1 surface. If it has only 1surface and it is a solid, then it must be a sphere, but the surface of a sphere is not flat is it? By using the word 'solid' then by definition, it is three dimensional and has thickness. A cylinder has no vertices , but it has 2flat surfaces. A vertex is a point where three lines meet, such as on a pyramid, which has 4 vertices. Have I forgotten something or is this a 'trick' question?
none!all shapes are flat
half a sphere