diff --git a/guide/english/mathematics/surface-area-of-a-sphere/index.md b/guide/english/mathematics/surface-area-of-a-sphere/index.md
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--- a/guide/english/mathematics/surface-area-of-a-sphere/index.md
+++ b/guide/english/mathematics/surface-area-of-a-sphere/index.md
@@ -3,13 +3,15 @@ title: Surface Area of a Sphere
 ---
 ## Surface Area of a Sphere
 
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+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).
 
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+### 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)