# Need Help!

1. Aug 28, 2005

### tenchick19

I need help with this question: Sphere 1 has surface area A1 and volume V1, and Sphere 2 has surface area A2 and volume V2. If the radius of Sphere 2 is six times the radius of Sphere 1, what is the ration A2/A1 of the areas?

Part two: What is the ratio V2/V1 of the volumes?

2. Aug 28, 2005

### TD

For a sphere with radius R, area (A) and volume (V) are:

$$\begin{array}{l} A = 4\pi R^2 \\ V = \frac{4}{3}\pi R^3 \\ \end{array}$$

With your knowledge of the ratio's of the radii, that should help

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