Great stuff here. In my career as a builder, these methods made my life much easier. In school, it was all abstract. Once I was able to use Geometry and Trig., to put it in concrete form, it all made sense and became vital. Thank you for doing this video.
You can get all of the 30 degree lines without changing your compass radius. Once you get the first one by bisecting the 60 degree angle, you can then put the point on of the compass on the 30 degree line to get 30+60 aka 90 and then again on the 90 to get to 150. then after you get the 15 degree line, you can get do the same thing to get 75, & 135, then you only need to reset the compass once to get the remainder of the 15 degree lines.
