public class ShapeTester {
    
    public static void main(String[] args) {
        Square square = new Square(5,3,4);              //line A
        System.out.println();
        
        Polygon polygon = new Polygon(4,5);             //line B
        System.out.println();
        
        Circle circle = new Circle(5,1,2);
        System.out.println();
        
        //Shape shape = new Shape(3,4);                 //line C
        
        Shape myShape1 = square;                        //line D
        
        System.out.println(myShape1);                   //line E
        System.out.println(polygon);                    
        System.out.println(circle);                     //line F
        System.out.println();               
        
        square.printWhoAmI();                           //line G
    }
}