public class Carre {
private Rectangle m_rc;

public Carre(double lgr){
   m_rc = new Rectangle(lgr, lgr);
}

public double getCote(){
  return m_rc.getLargeur();
}

public void assign(double lgr){
  m_rc.assign(lgr, lgr);
}

public void afficher(){
  System.out.println("carre: C="+getCote());
}

public double surface(){
  return m_rc.surface();
}

public double perimetre(){
  return m_rc.perimetre();
}
}