What is the ratio V2/V1 of the volumes?

[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?

 

[TD]

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

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

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