public class Circle {

  public double kerulet(double r) {return 2*r*Math.PI;}
  public double terulet(double r) {return r*r*Math.PI;}

  public void  prog(String[] args) {
  System.out.println("Az "+args[0]+" sugarú kör kerülete: K="+kerulet(Double.parseDouble(args[0])));
  System.out.println("               és területe: T="+terulet(Double.parseDouble(args[0])));
  }

  public static void main(String[] args) {
    Circle e = new Circle();
    e.prog(args);
  }
}