11:15 AM, Saturday August 28th 2021
I think you are somewhat more competent at this drawabox thing than me although I am currently struggling with this same exercise.
I don't think the rules allow you to use a ruler. I would argue that if you have internalised lesson 1 then drawing these lines freehand should be reasonably straightforward. The overall purpose is to be able to understand and create a cylinder in 3d space without requiring drawing aids. This is necessary to internalising how cylinders work and help you to be able to vision them. Using a ruler would likely reduce your care and absorption in doing this.
I am not struggling with drawing the straight lines, in fact it is probably the only bit of this exercise I am OK with. The first type of cylinder wasn't too bad but using the flat planes method is destroying my brain. I will overcome.