package shiyan2;

// Test.java
public class Test {
    public static void main(String[] args) {
        Shape circle = new Circle(3);
        Shape rectangle = new Rectangle(4, 5);
        Shape triangle = new Triangle(6, 7);

        ShapeUtil.printArea(circle);
        ShapeUtil.printArea(rectangle);
        ShapeUtil.printArea(triangle);
    }
}