A pyramid (3D)!
Some examples:
- triangular base pyramid
- square base pyramid
- rectangular base pyramid
- cone
a sphere
sphere
a pyramid as long as there is only one base more specifically a rectangular pyramid
A 3D shape with one base and three faces can only have triangular faces.
The answer depends on the shape of the base: the appropriate formula will vary from one shape to another.
A sphere has no base, and since it has no base, it has only a surface area and no lateral area.
A sphere has no base, and since it has no base, it has only a surface area and no lateral area.
A cone.
A cone has one vertex, one edge, and one base.
It would help to know what shape you are talking about. But since you have not bothered to provide that information, I cannot provide a sensible answer.
It is the base/face of a certain shape, as in a square, it would be the bottom line(the one on/closest to the ground).
In geometry, the only shape that has one surface is a plane.