## anonymous 4 years ago The ratio between the radii of two spheres is 9:2 What is the ratio of their volumes?

1. anonymous

cube the ratios

2. anonymous

is it 729:8 ?

3. anonymous

r:R is ratio between radii then r^3:R^3 is ratio between volume

4. anonymous

so am i correct then?

5. anonymous

$V1/V2 = (4*\pi*r1^3)/(4*\pi*r2^3)$

6. anonymous

Volume is proportional to the cube of the radius

7. anonymous

im confused am i wrong then?

8. kropot72

9. anonymous

ok thank you!

10. anonymous

Answer is correct.....i was just giving u the concept @ineedhelponmyhw

11. kropot72

You're welcome :)