public class Program {
  public static void main(String [] args){
    Sirkel s1 = new Sirkel(5);
    System.out.println(s1);
    double omkrets = s1.hentOmkrets();
    System.out.println("Omkrets: " + omkrets);

    Figurer k1 = new Kvadrat(10);
    System.out.println(k1);
    System.out.println("Omkrets: " + k1.hentOmkrets());
  }
}