a sphere
you are a cone
A face.
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.
A cylinder would fit the given description.
A cone fits the description.
A cone. If your definition of rolling includes the motion of a cone down an incline.
A a solid figure on a flat surface is a plane figure (I do believe)
Only if you push it. On a perfectly flat surface, in neutral it will not roll without assistance.
a sphere
The flat surface of a solid figure is called a face. For example, a rectangular prism has 6 flat surfaces and therefore 6 faces.
the flat surfaces of a solid figure are the
you are a cone
The crust is the solid surface of the Earth.
According to my son's math homework a flat surface on a solid is called a face
A face is the flat surface on a solid figure. For example, a triangular prism has five flat surfaces and therefore five faces.
A face.