Wheel

 double radius;

  Wheel (double radius) {
    this.radius = radius;
  }

  double getCircumference () {
    return 2 * Math.PI * radius;
  }
  double getArea () {
    return radius * radius * Math.PI;
  }

  public static void main (String[] args) {

    System.out.println("Please provide a real.");
    Scanner s = new Scanner(System.in);
    double d = s.nextDouble();

    System.out.println(d);

    Wheel w = new Wheel(d);
    System.out.println(w.getCircumference());
    System.out.println(w.getArea());
  }
}