package geometria; public abstract class Poligono extends EntitaGeometrica { protected double lato(Punto a, Punto b) { double temp = Math.sqrt((b.gety()-a.gety())* (b.gety()-a.gety())+(b.getx()-a.getx())* (b.getx()-a.getx())); return temp; } public abstract double perimetro(); public abstract double area(); public void stampa() { System.out.println("\nSono un poligono generico"); } }