A plane is a flat surface with no thickness
It's a 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).
A plane
A flat surface that extends forever is a plane
A plane.
plane
A plane
A plane.
A plane is a flat surface with no thickness
A plane.
It is a plane
A plane is a flat surface with no thickness. It is also one of the undefined terms in mathematics which extends indefinitely in all directions.
plane
It's a plane.
A plane