the cylinders shown below are similar.

what is the ratio of their side lengths?

To find the ratio of the side lengths of the two cylinders, we can compare the height of Cylinder B to the height of Cylinder A.

Let the height of Cylinder A be represented by "h" and the height of Cylinder B be represented by "2h".
The ratio of their side lengths would be:

Ratio = Height of Cylinder B / Height of Cylinder A
Ratio = 2h / h
Ratio = 2

Therefore, the ratio of their side lengths is 2:1.