A mirror with a flat surface - planar
Its base is a flat surface
A flat surface generally refers to a horizontal surface and is referred to as the plane.
A flat surface that extends forever is a plane
Three points define a plane, which is a flat surface.
If it is your surface then whatever you like. And if it is not yours, then nothing - without the owner's permission.
Plate Tectonics, to put it simply.
It does not have a flat surface.
You place your bottom on a flat, level surface; and put your weight on it. It's that simple.
Flatter
The flat surface that goes on and on in all directions has no boundaries. This flat surface is called infinite surface. Accordingly, the answer is that the flat surface that goes on and on in all directions is called an infinite surface.
A plane is a flat surface with no thickness
A flat, level surface is a plane.
It is a drawing of the earth on a flat surface
A mirror with a flat surface - planar
Its base is a flat surface
A flat surface generally refers to a horizontal surface and is referred to as the plane.