public class Main {
    public static void main(String[] args) {
        Shape circle = new Circle(5);
        Shape rectangle = new Rectangle(4, 6);
        Shape triangle = new Triangle(3, 8);
        
        System.out.println("Circle:");
        ShapeUtil.printArea(circle);
        ShapeUtil.drawShape(circle);
        
        System.out.println("Rectangle:");
        ShapeUtil.printArea(rectangle);
        ShapeUtil.drawShape(rectangle);
        
        System.out.println("Triangle:");
        ShapeUtil.printArea(triangle);
        ShapeUtil.drawShape(triangle);
    }
}