A Cone
The answer is - a cone.
A cone.
Cone.
A cone.
A sphere sliced by a plane; or a cone.
A Cone
The answer is - 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
The object described is a cone. A cone has one vertex (the point where the flat face meets the curved surface) and one flat face (the circular base). Due to its shape, a cone can roll along a flat surface smoothly.
-- 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.