Question

The height and radius are the same in both cylinders. Which cylinder has the greatest volume?

Answer 1

The correct answer is 
C) The volume is the same in both cylinders.

In fact, the volume of a cylinder is:
$V= A h = \pi r^2 h$
where r is the radius of the base and h the height of the cylinder. This formula is valid for both right and non-right cylinders, and since the two cylinders in the figure have same radius and height, their volume is equal.