IKMC 2021 - Grades 11-12 - Set 2 - Self-study Question 6

Question 6

A rectangle has length $x$ and width $y$, with $x>y$. Roll it into a cylinder’s curved surface in either possible orientation. What is the volume ratio of the longer cylinder to the shorter cylinder?

$y^2:x^2$
$y:x$
$1:1$
$x:y$
$x^2:y^2$