what is the name of an flat surthis
The name given to flat areas between bumps and hollows on Earth's surface is "plateau". Plateaus are elevated flat-topped areas that are higher than the surrounding terrain.
The name given to an area that is a flat treeless plain is a steppe.
A face.
A floor.
A base
A face.
Base.
Map
A flat mirror is generally referred to simply as a flat mirror. It is a mirror with a flat reflective surface that does not have any curvature.
It is a plane.
A face is a flat surface. The only solid with no flat surfaces is a sphere.
A face. For example, a cube has 6 faces.