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No, you don't perform CPR on an inclined surface. It must be horizontal, flat, and hard (not deflect while giving compressions).
It does not have a flat surface.
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.
When a curved surface is represented on a flat surface, usually either distances or directions must be distorted. Various "projections" exist to minimize these distortions in whatever way is important to the cartographer.
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.
They distort the surface because they are flat, while the surface is not.