freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-332-spherical-triangles.md

---
id: 5900f4b91000cf542c50ffcb
title: 'Problem 332: Spherical triangles'
challengeType: 5
forumTopicId: 301990
dashedName: problem-332-spherical-triangles
---

# --description--

A spherical triangle is a figure formed on the surface of a sphere by three great circular arcs intersecting pairwise in three vertices.

Let C(r) be the sphere with the centre (0,0,0) and radius r. Let Z(r) be the set of points on the surface of C(r) with integer coordinates. Let T(r) be the set of spherical triangles with vertices in Z(r). Degenerate spherical triangles, formed by three points on the same great arc, are not included in T(r). Let A(r) be the area of the smallest spherical triangle in T(r).

For example A(14) is 3.294040 rounded to six decimal places.

Find A(r). Give your answer rounded to six decimal places.

# --hints--

`euler332()` should return 2717.751525.

```js
assert.strictEqual(euler332(), 2717.751525);
```

# --seed--

## --seed-contents--

```js
function euler332() {

  return true;
}

euler332();
```

# --solutions--

```js
// solution required
```