Thanks Grace for speed answer
I poorly spoke in English
Very sorry, I attached wrong printscreen
I think about tangent line which I don't know where are located points so I can't creation these...
It must be line without the beginning and the end.
Just straight secondary line. Of course I know that it will be maybe unenforceable
I sew forum and UserManual and I can't imagine which tool would be helpful...
I need draw center of the front line in blouse, then I close dart with this secondary line. I don't know how to around this operation.
I have different method to construction blouse but it's my favourite and the best for me, especially if I'm going to move dart bust
On my mind is tool - example: we had drawn two arcs and we indicate arcs (circles) and then tool creates two point tangent to this circle. Later we can do this
and we have example center of the front line :)))