The shape of the face on a cone is a circular base at the bottom and a curved surface that narrows smoothly to a point called the apex. This curved surface is referred to as the lateral face of the cone. Overall, a cone has one circular face (the base) and one curved surface.
cone
circle
A sphere sliced by a plane; or a cone.
If it has one face.
a circle
A frustum of a cone.
a cone
cone
cone
Cone.
The answer is - a cone.
A Cone