Posted by **how do i start working on this problem** on Friday, April 6, 2012 at 2:38pm.

Jake has two similar cylindrical pipes. The radius of the first cylindrical pipe is 5 cm. The circumference of the second cylindrical pipe is 20π cm.

The volume of the second cylindrical pipe is how many times greater than the volume of the first cylindrical pipe?

A.3

B.4

C.5

D.8

- Geometry -
**Steve**, Friday, April 6, 2012 at 2:52pm
since C=2pi*r, the radius of the 2nd pipe is 20π/2π = 10

so, the 2nd pipe has radius twice the 1st pipe.

If linear dimensions scale by n,

area scales by n^2

volume scales by n^3

So, now you have what you need.

- Geometry -
**Anonymous**, Thursday, June 7, 2012 at 2:21pm
8

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