Hi Burr, that's a cool one, I think that does work because you basically form this isosceles triangle here:
which has the same angles as the extended one:
But sometimes it can be hard to remember a method that involves drawing things in a kind of different initial direction than what the main goal is though.
Hi Burr - for speed, I would think that your method there is going to be the fastest since you get the right snap point after creating just 1 construction line.
Just to be clear, if I was going to do any kind of isoscele, I would have to go out to the backyard and dig that guy up and take his bones far, far away! :O
This old thread is the first Google result for "moi3d construct tangent", so I wanted to put a tip here that I just found out:
If tangent snapping does not work ("Tan" doesn't appear) it's probably because the point at which you started the line is part of three-dimensional geometry and the point and the circle are not aligned in the third dimension.
