class Circle1 {
  double radius;

  /** Construct a circle with radius 1 */
  Circle1() {
    radius = 1.0;
  }

  /** Construct a circle with a specified radius */
  Circle1(double newRadius) {
    radius = newRadius;
  }

  /** Return the area of this circle */
  double getArea() {
    return radius * radius * Math.PI;
  }
}