WorkArea.java
package shapes;
import java.awt.Color;
import javax.swing.SwingUtilities;
import painter.SPainter;
import shapes.SCircle;
import shapes.SRectangle;
import java.util.Scanner;
public class WorkArea {
    public static void main(String[]args){
        SRectangle desk = new SRectangle(24, 36);
        SRectangle book = new SRectangle(8.5, 11);
        SCircle glass = new SCircle(1.35);
        SSquare coaster = glass.circumscribingSquare();
        SCircle dinner_Plate = new SCircle(8);

        double DeskArea = desk.area();
        double AvailableArea = DeskArea - (2*book.area() + 3*coaster.area() + 3*dinner_Plate.area() );
        System.out.println("This is a mess, you only have " + AvailableArea + " to work with!");

    }

}

Demo

This is a mess, you only have 51.94421051075972 to work with!
Process finished with exit code 0