1. The problem statement, all variables and given/known data Jack and Jill each roll a sheet of 9X12 paper to form a cylinder. Jack tapes the two 9-inch edges together. Jill tapes the two 12-inch edges together. Which is greater? The volume of Jack's Cylinder or The volume of Jill's cylinder. 2. Relevant equations Cylinder Volume: V=pi*r^2*h 3. The attempt at a solution The problem that I was facing with this question was finding the radii. However, I looked at the solutions and it says that Jack's cylinder has a circumference of 12 and Jill's cylinder has a circumference of 9 Jack's height is 9 Jill's height is 12 I don't understand how they derived the circumferences ?! once I know the circumference I can find the radius. Thanks.