Seamly2D tutorial: 3-point curve on back armhole

Thirdly, I did a video on a scalable 3-point curve on the back armhole, again using the "curved path" tool.
Technically, it works just like the front curve, but it uses different reference measures. Check this out to compare the differences to the front armhole.
-- Hi everyone, in this video tutorial series, I will try to do something useful: I'll present some basic and extended features of the very awesome Open Source Patternmaking software Seamly2D, and I hope these may help in your pattern making process! --