circle

public class Circle {
    private double radius;

    public Circle(double radius) {
        this.radius = radius;
    }

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

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






import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Введите радиус круга: ");
        double radius = scanner.nextDouble();

        Circle circle = new Circle(radius);

        System.out.printf("Площадь круга: %.2f\n", circle.getArea());
        System.out.printf("Длина окружности: %.2f\n", circle.getCircumference());
    }
}