Hi Mohammed, if you chose to offset the line you either create mid point vertical lines then you offset both side with half the measurement of 6.5 which is 3.25.
thank you for your explanation but i have a question... in the next method of drawing an angle the x-axis is on the previous line but how can i know the direction of the y-axis left or right ???
Hi Yehya, once you determine the location of x-axis which is the previous line, the y-axis has two directions only. Based on my experience either way you can still locate the correct angles.