//Rectangle.java

public class Rectangle extends Shape
{
    private double length, height;

    Rectangle
    (
        Point upperLeft,
        double length,
        double height
    )
    {
        this.position = upperLeft;
        this.length = length;
        this.height = height;
    }

    @Override
    public double computeArea()
    {
        return (length * height);
    }
}