Each surface of a polyhedron is called a face.
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It is called the surface area.
It is called a face of the polyhedron.
Sum the areas of each face.
Add up the surface area of each of the polygonal faces. There may be a short cut available if it is a regular polyhedron so that all the polygons are the same.
A polyhedron is a three dimensional figure made up of sides called faces, where each face is a polygon.