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# 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

- 9 years agoFavorite 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 - 9 years ago
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