freeCodeCamp/curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-85-counting-rectangles.english.md

---
id: 5900f3c11000cf542c50fed4
challengeType: 5
isHidden: false
title: 'Problem 85: Counting rectangles'
forumTopicId: 302199
---

## Description
<section id='description'>

By counting carefully it can be seen that a rectangular grid measuring 3 by 2 contains eighteen rectangles:

<img class="img-responsive center-block" alt="a diagram of the different rectangles found within a 3 by 2 rectangular grid" src="https://cdn-media-1.freecodecamp.org/project-euler/counting-rectangles.png" style="background-color: white; padding: 10px;">

Although there exists no rectangular grid that contains exactly two million rectangles, find the area of the grid with the nearest solution.

</section>

## Instructions
<section id='instructions'>

</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>countingRectangles()</code> should return a number.
    testString: assert(typeof countingRectangles() === 'number');
  - text: <code>countingRectangles()</code> should return 2772.
    testString: assert.strictEqual(countingRectangles(), 2772);

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
function countingRectangles() {
  // Good luck!
  return true;
}

countingRectangles();
```

</div>



</section>

## Solution
<section id='solution'>

```js
// solution required
```

</section>