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

---
id: 5900f3c11000cf542c50fed4
title: 'Problem 85: Counting rectangles'
challengeType: 5
forumTopicId: 302199
dashedName: problem-85-counting-rectangles
---

# --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.

# --hints--

`countingRectangles()` should return a number.

```js
assert(typeof countingRectangles() === 'number');
```

`countingRectangles()` should return 2772.

```js
assert.strictEqual(countingRectangles(), 2772);
```

# --seed--

## --seed-contents--

```js
function countingRectangles() {

  return true;
}

countingRectangles();
```

# --solutions--

```js
// solution required
```