A Cone
The answer is - a cone.
A cone.
Cone.
A cone.
A Cone
The answer is - a cone.
A sphere sliced by a plane; or a cone.
A cone.
Cone.
A cone.
A cone. It has a circle for the base, and a curved face tapering to a point.
A cone
Cone
-- hemisphere -- cone -- semifootball
If you are a cube, one of the sides is called a face. Same with a cone, the flat part is a face.
A cone would fit the given description