From 7086ed7007c887ecd9a325910b02d0fb487b686a Mon Sep 17 00:00:00 2001 From: Andrew Mackie Date: Mon, 11 Mar 2019 12:02:25 -0700 Subject: [PATCH] New article. (#28260) * New article. * Change to md format --- .../mathematics/surface-area-of-a-sphere/index.md | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/guide/english/mathematics/surface-area-of-a-sphere/index.md b/guide/english/mathematics/surface-area-of-a-sphere/index.md index 405b2dfa99..9acfd6dfd6 100644 --- 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 -This is a stub. Help our community expand it. +The surface area **A** of a sphere with radius **r** may be calculated by the following formula: +#### A = 4πr² +where **π** is the ratio of a circle's circumference to its diameter (π ≈ 3.14159). -This quick style guide will help ensure your pull request gets accepted. +### Example: +*Problem:* Given a sphere with a radius of 11 inches, find its surface area. - +*Solution:* A = 4×*π*×11² ≈ 1520.5 square inches #### More Information: - - +- [Wikipedia](https://en.wikipedia.org/wiki/Sphere)