freeCodeCamp/curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-91-right-triangles-with-integer-coordinates.md

---
id: 5900f3c71000cf542c50feda
challengeType: 5
title: 'Problem 91: Right triangles with integer coordinates'
forumTopicId: 302208
---

## Description
<section id='description'>

The points P (<var>x</var><sub>1</sub>, <var>y</var><sub>1</sub>) and Q (<var>x</var><sub>2</sub>, <var>y</var><sub>2</sub>) are plotted at integer co-ordinates and are joined to the origin, O(0,0), to form ΔOPQ.

<img class="img-responsive center-block" alt="a graph plotting points P (x_1, y_1) and Q(x_2, y_2) at integer coordinates that are joined to the origin O (0, 0)" src="https://cdn-media-1.freecodecamp.org/project-euler/right-triangles-integer-coordinates-1.png" style="background-color: white; padding: 10px;">

There are exactly fourteen triangles containing a right angle that can be formed when each co-ordinate lies between 0 and 2 inclusive; that is, 0 ≤ <var>x</var><sub>1</sub>, <var>y</var><sub>1</sub>, <var>x</var><sub>2</sub>, <var>y</var><sub>2</sub> ≤ 2.

<img class="img-responsive center-block" alt="a diagram showing the 14 triangles containing a right angle that can be formed when each coordinate is between 0 and 2" src="https://cdn-media-1.freecodecamp.org/project-euler/right-triangles-integer-coordinates-2.png" style="background-color: white; padding: 10px;">

Given that 0 ≤ <var>x</var><sub>1</sub>, <var>y</var><sub>1</sub>, <var>x</var><sub>2</sub>, <var>y</var><sub>2</sub> ≤ 50, how many right triangles can be formed?

</section>

## Instructions
<section id='instructions'>

</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>rightTrianglesIntCoords()</code> should return a number.
    testString: assert(typeof rightTrianglesIntCoords() === 'number');
  - text: <code>rightTrianglesIntCoords()</code> should return 14234.
    testString: assert.strictEqual(rightTrianglesIntCoords(), 14234);

```

</section>

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

<div id='js-seed'>

```js
function rightTrianglesIntCoords() {

  return true;
}

rightTrianglesIntCoords();
```

</div>



</section>

## Solution
<section id='solution'>

```js
// solution required
```

</section>