freeCodeCamp/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-449-chocolate-cover...

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---
id: 5900f52d1000cf542c510040
challengeType: 5
title: 'Problem 449: Chocolate covered candy'
---
## Description
<section id='description'>
Phil the confectioner is making a new batch of chocolate covered candy. Each candy centre is shaped like an ellipsoid of revolution defined by the equation: b2x2 + b2y2 + a2z2 = a2b2.
Phil wants to know how much chocolate is needed to cover one candy centre with a uniform coat of chocolate one millimeter thick.
If a=1 mm and b=1 mm, the amount of chocolate required is
283
π mm3
If a=2 mm and b=1 mm, the amount of chocolate required is approximately 60.35475635 mm3.
Find the amount of chocolate in mm3 required if a=3 mm and b=1 mm. Give your answer as the number rounded to 8 decimal places behind the decimal point.
</section>
## Instructions
<section id='instructions'>
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>euler449()</code> should return 103.37870096.
testString: 'assert.strictEqual(euler449(), 103.37870096, "<code>euler449()</code> should return 103.37870096.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function euler449() {
// Good luck!
return true;
}
euler449();
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>