import java.util.ArrayList;

public class InteractiveMath3
{

 
ArrayList<Shape> shapes;


public InteractiveMath3(){
 
shapes = new ArrayList<Shape>();


}


//loop through each object and call their various 'render' methods
public void paintShapes(){


}





//@ returns the area of all of the circles and all of the rectangles and triangles
public double  computeNetArea(){
double r =0;


for( int i = 0 ;i< shapes.size() ;i ++)
 {
  r += shapes.get(i).getArea();
  }
 
 return r;
}



}