ShapesThing.java
package shapes;

public class ShapesThing {
    public static void main(String[] args){
        SSquare square = new SSquare(400);
        SCircle disk = square.inscribingCircle();
       SSquare diamond = disk.inscribingSquare();
        System.out.println("square = " + square.toString());
        System.out.println("area of square = " + square.area());
        System.out.println("diagonal of square = " + square.diagonal());
        System.out.println("perimeter of square");
        System.out.println("disk =" + disk.toString());
        System.out.println("area of disk =" + disk.area());
        System.out.println("perimeter of disk = " + disk.perimeter());
        System.out.println("diamond =" + diamond.toString());
        System.out.println("Area of diamond =" + diamond.area());

        square.area();
      square.diagonal();
      square.perimeter();
        disk.area();
        disk.perimeter();
        diamond.area();

       }
}