It is called the surface area.
a base
A face.
Each surface of a polyhedron is called a face.
faces every polyhedron has one
It is a polyhedron.
It is a face of the polyhedron
They are its faces
a base
A face.
Each surface of a polyhedron is called a face.
faces every polyhedron has one
cross section
It is a polyhedron.
faces
Its surface, would you believe!
Face
Yes and its flat surface faces are in regular shapes.