import java.util.Scanner;

// Define the interface with a method to compute the area
interface AreaComputable {
    double computeArea();
}

// Rectangle class implementing AreaComputable interface
class Rectangle implements AreaComputable {

    private double length;
    private double width;

    // Constructor to initialize rectangle dimensions
    public Rectangle(double length, double width) {
        this.length = length;
        this.width = width;
    }

    // Implement computeArea() method
    public double computeArea() {
        return length * width;
    }
}

// Circle class implementing AreaComputable interface
class Circle implements AreaComputable {

    private double radius;

    // Constructor to initialize circle radius
    public Circle(double radius) {
        this.radius = radius;
    }

    // Implement computeArea() method
    public double computeArea() {
        return Math.PI * radius * radius;
    }
}

// Main class to run the program
public class RecCircleInterface {

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

        // Input and compute area of the rectangle
        System.out.println("Enter length and width of the rectangle:");
        double length = scanner.nextDouble();
        double width = scanner.nextDouble();
        Rectangle rectangle = new Rectangle(length, width);
        System.out.println("Area of Rectangle: " + rectangle.computeArea());

        // Input and compute area of the circle
        System.out.println("Enter radius of the circle:");
        double radius = scanner.nextDouble();
        Circle circle = new Circle(radius);
        System.out.println("Area of Circle: " + circle.computeArea());

        scanner.close();
    }
}