public interface ShapesIF {
	
	public double PI =  3.14159;
	
	// compute area of rectangle	
	public int areaRec(int length, int width);
	
	// compute area of square: rectangle with equal length and width
	public int areaRec(int width);
	
	// compute area of ellipse
	public double areaEllipse(int major, int minor);
	
	// compute area of circle: ellipse with equal major and minor
	public double areaEllipse(int radius);
	
}