Complete the methods rectangleArea, rectanglePerimeter, and rectangleDiagonal Use the following incomplete code as a start: Methods demonstration #1 - rectangle calculations: rectangleArea, rectanglePerimeter, rectangleDiagonal Author: Created: import java.util.Scanner public class MethodDemovi { public static void main(String] args) { double length = 3.0; double width = 7.0 double area = rectangleArea(length, width); double perimeter = rectanglePerimeter(length, width); double diagonal = rectangleDiagonal(length, width); System.out.printf("Area: %.1f Perimeter: %.1f Diagonal: %. 1f, area, perimeter, diagonal); } double width = 7.0; double area = rectangleArea(length, width); double perimeter = rectanglePerimeter(length, width); double diagonal = rectangleDiagonal(length, width); System.out.printf("Area: %.1f Perimeter: %.1f Diagonal: %.1f", area, perimeter, diagonal): } Compute the area of a rectangle @param I the length of the rectangle @param w the width of the rectangle @return the area of the rectangle public static double rectangleArea(double I, double w) { return I*w