Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

# Math question, need help!!?

A sphere has the same numerical value for both its surface area and its volume. Find the radius of the sphere.

I have no idea where to even start on this. Please help! Thanks :)

### 3 Answers

Relevance
• Favorite Answer

You would take the surface area formula (4 • π • r²) and put into an equation as equal to the volume formula (4/3 • π • r³) and then solve for r as if it were a normal equation, like this:

4/3 • π • r³ = 4/3 • π • r³

Source(s): Sphere formulas: http://www.1728.org/diamform.htm
• Set formulas for area and volume to be equal, and solve.

4/3 Pi r^3 = 4 Pi r^2

You can figure it out from there... I hope

• 4/3ÏR^3=4ÏR^2 is where I'd go with it.

Still have questions? Get your answers by asking now.