/*
 *  Write code that adds an 'area' method to the Rectangle class' prototype
 */
    Rectangle.prototype.area = function() {
        return(this.w*this.h);
    }
/*
 * Create a Square class that inherits from Rectangle and implement its class constructor
 */
   class Square extends Rectangle { 
        constructor(s){
            this.s = s;
        }
        area() {
            return (this.s*this.s);
        }
    }