A flat surface that extends forever is a plane
A plane.
Plane
A cone has one flat surface, which is its circular base. The curved surface that extends from the base to the apex is not flat. Therefore, in total, a cone has one flat surface.
I thick it is called a plane
A plane?
A plane.
A plane
A plane
A plane.
A plane =)
A plane
Plane
A plane
It is a plane that extends indefinitely in all directions. It is very easy to remember just think about what flys in the air and needs to land on a "flat surface that extends indefinitely in all directions" (the ground).
I thick it is called a plane
plane
plane