public class Rectangle implements Shape {

    // private double n;
    
    /*    public Circle(double n) {
        this.n = n;
        }
    */
        public double calculateArea(double n, double m) {
            return m*n;
    
    }
    
        public double calculatePerimeter(double n, double m) {
            return 2*m + 2*n;
    }
    
    }