Question

A cylinder has its radius doubled and its height halved. What is the ratio of the volume of the original cylinder to the changed cylinder?

Answer 1

@ Sweenger, the ratio of each of these relative to another is 1:1

Answer 2

The back of the book says it's 1:2 - But I don't understand why.

Answer 3

volume = pi r^2 h
r goes to 2r increases volume by 4
h halved halves that new volume
total effect is doubling the volume