One whose boundaries are straight lines.
A polyhedron
cube There are a great many solid shapes that have only flat surfaces.
A sphere.
A cylinder
One whose boundaries are straight lines.
The flat surface of a solid figure is called a face. For example, a rectangular prism has 6 flat surfaces and therefore 6 faces.
A polyhedron
a polyhedron
the flat surfaces of a solid figure are the
true
Polyhedron (plural polyhedra)
A SPHERE has no vertices and no FLAT surfaces
true
cube There are a great many solid shapes that have only flat surfaces.
A sphere.
Yes and its flat surface faces are in regular shapes.