 So this video is to help you understand what you can do to measure these lines if you don't have a printer and Just to understand why this is important is on a computer Depending on how zoomed in you are this isn't going to match actual centimeters But what you can do is when you've got it on your screen Go ahead and put a piece of paper up on your screen and very carefully without Pressing on your screen too hard without writing on your screen You mark down the the starting and ending points of the line and then you scroll up And you can put it up next to your ruler Lining one side up with the zero and then the other side With your measurements so that you can find out exactly where you are I've got kind of thick paper, so I'm actually going to turn it around here So that when I use my measurements, I can have it here and again I just line one side up with the zero and then I can see where the other side falls on The ruler so I can make the measurements even though I don't have a printer to be able to print those things out