public class RoundAndRound {
    public static void main(String[] args) {
        Circle circle1 = new Circle();
        circle1.radius = 5.1;
        // calculate the remaining attributes for circle1 here

        Circle circle2 = new Circle();
        circle2.radius = 17.5;
        // calculate the remaining attributes for circle2 here

        System.out.println("circle1.radius = " + circle1.radius);
        
        // add more output-commands here
    }
}