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New article. (#28260)

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* New article.

* Change to md format
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Andrew Mackie
2019-03-11 12:02:25 -07:00
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guide/english/mathematics/surface-area-of-a-sphere/index.md
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@ -3,13 +3,15 @@ title: Surface Area of a Sphere
---
## Surface Area of a Sphere
This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/mathematics/surface-area-of-a-sphere/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
The surface area **A** of a sphere with radius **r** may be calculated by the following formula:
#### A = 4&pi;r&sup2;
where **&pi;** is the ratio of a circle's circumference to its diameter (<em>&pi;</em> &approx; 3.14159).
<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
### Example:
*Problem:* Given a sphere with a radius of 11 inches, find its surface area.
<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds -->
*Solution:* A = 4&times;*&pi;*&times;11&sup2; &approx; 1520.5 square inches
#### More Information:
<!-- Please add any articles you think might be helpful to read before writing the article -->
- [Wikipedia](https://en.wikipedia.org/wiki/Sphere)