ShapesThing.java
package shapes;

public class ShapesThing {
    public static void main(String[] args){
        SSquare square = new SSquare(400);
        System.out.println("Square = " + square.toString());
        System.out.println("Are of Square = " + square.area());
        System.out.println("Perimeter of Square = " + square.perimeter());
        System.out.println("Diagonal of Square = " + square.diagonal());

        // computations on a circle
        SCircle disk = square.inscribingCircle();
        System.out.println("Disk = " + disk.toString());
        System.out.println("Area of Square = " + square.area());
        System.out.println("Area of Disk = " + disk.area());
        System.out.println("Perimeter of Square = " + square.perimeter());
        System.out.println("Perimeter of Disk = " + disk.perimeter());

        //computations on another square
        SSquare diamond = disk.inscribingSquare();
        System.out.println("Diamond = " + diamond.toString());
        System.out.println("Area of Diamon = " + diamond.area());
    }
}