This question has options. How would someone go about accomplishing this goal?
How should I cut the bottom of a paper tube so that it is flat?

pick from the following.
A). Before you roll the paper into a tube use a ruler to measure the length that you want to cut off and draw a line across the paper, once the paper is in the tube use the scissors and follow the line on the paper that you previously made in order to ensure the end is flat.
B). Before you roll the towel into a tube use a ruler to measure the length that you want to cut off and draw a line across the paper, once the towel is in the tube use the scissors and follow the line on the paper that you previously made in order to ensure the end is flat.
A).