https://codeperfectplus.com/10-days-of-javascript-day-1

arithmetic_operators.js

/**
 *   Calculate the area of a rectangle.
 *
 *   length: The length of the rectangle.
 *   width: The width of the rectangle.
 *   
 *	Return a number denoting the rectangle's area.
 **/
function getArea(length, width) {
    let area;
    // Write your code here
    area = length * width;
    return area;
}

/**
 *   Calculate the perimeter of a rectangle.
 *	
 *	length: The length of the rectangle.
 *   width: The width of the rectangle.
 *   
 *	Return a number denoting the perimeter of a rectangle.
 **/
function getPerimeter(length, width) {
    let perimeter;
    // Write your code here
    perimeter = 2 * (length + width);
    return perimeter;
}