Each flat surface is a face
If you mean 1 flat surface and 1 vertex, then the only thing I can think of is a cone.
Cone
A sphere.
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 a solid figure on a flat surface is a plane figure (I do believe)
The flat surface of a solid figure is called a face. For example, a rectangular prism has 6 flat surfaces and therefore 6 faces.
the flat surfaces of a solid figure are the
One of the figure which has no flat surface is Sphere.
A face is the flat surface on a solid figure. For example, a triangular prism has five flat surfaces and therefore five faces.
Each flat surface is a face
A plane
A face
rectangle
If you mean 1 flat surface and 1 vertex, then the only thing I can think of is a cone.
Cone
face