1: //Rectangle.java 3: public class Rectangle extends Shape 4: { 5: private double length, height; 7: Rectangle 8: ( 9: Point upperLeft, 10: double length, 11: double height 12: ) 13: { 14: this.position = upperLeft; 15: this.length = length; 16: this.height = height; 17: } 19: @Override 20: public double computeArea() 21: { 22: return (length * height); 23: } 24: }