One whose boundaries are straight lines.
Prism
A polyhedron
cube There are a great many solid shapes that have only flat surfaces.
A sphere.
A cylinder
Prism
the flat surfaces of a solid figure are the
A polyhedron
a polyhedron
Polyhedron (plural polyhedra)
true
A SPHERE has no vertices and no FLAT surfaces
true
What figure has 6 flat surfaces that all look exactly the same
cube There are a great many solid shapes that have only flat surfaces.
A sphere.
A face is a flat surface. The only solid with no flat surfaces is a sphere.