The radius of one sphere is twice as great as the radius of a second sphere.

The ratio of the volume of the smaller sphere to the volume of the larger sphere is _____.
A.) 1:2
B.) 1:4
C.) 1:8
D.) 1:16

Question

The radius of one sphere is twice as great as the radius of a second sphere.

The ratio of the volume of the smaller sphere to the volume of the larger sphere is _____.
A.) 1:2
B.) 1:4
C.) 1:8
D.) 1:16

anonymous · Answer

I don't have a good idea on how to do this, help would be much appreciated! thank you :)

anonymous · Answer

Do you know the formula for volume of sphere?

anonymous · Answer

yeah, V=4/3pie r^3

anonymous · Answer

So R = 2r
4/3pie r^3/4/3pie (2r)^3 = 1/8

anonymous · Answer

r^3/(2r)^3= 1/2^3 = 1/8

anonymous · Answer

oh wait, I'm getting confused, so I just plug in 2r for the radius, cube it, then times it by 4/3?

anonymous · Answer

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