According to my son's math homework a flat surface on a solid is called a face
A face.
A face is a flat surface. The only solid with no flat surfaces is a sphere.
Cone
A face.
A face
A sphere has a surface but no flat face.
The crust is the solid surface of the Earth.
The flat surface of a solid figure is called a face. For example, a rectangular prism has 6 flat surfaces and therefore 6 faces.
It's called a face
A face is the flat surface on a solid figure. For example, a triangular prism has five flat surfaces and therefore five faces.
face