Class Polyhedron

public abstract class Polyhedron {

protected int nFaces, nVertices, nEdges;

protected double width, length, height;

public void describe() {

System.out.println("This polyhedron has "

+ nFaces + " faces, " + nVertices +

" vertices, and " + nEdges + " edges. Its volume is "

+ volume());

}

public abstract double volume();

}