Some can help to give advice of Arc Drawing in grasshopper(with a tangent line and the center of the circle is on the Y-axis)? )

[zmaomao981 (MZ)]

Hey Everyone,
I am a new beginner and now trying to draw a arc in grasshoper,as in picture.
I have already the figure in blue line in Rhino,ang want to in grasshopper draw a arc ,which tangent to line 1,and point of tangency is A,the center of the arc is on the on the Y-axis. then delete the two red marked line

I try to figure it like this and to delete line I try to use GHpython but didn’t work.

Can someone give me some advice?
Arc.gh (4.3 KB)
Thank you so much!

[Mahdiyar]

You need to either Internalise your Curves, or upload the .3dm file you referenced your Curves from.

Arc.gh (19.5 KB)

[zmaomao981 (MZ)]

hello Mahdiyar,
Thank you very much. This is what I want.
And can you tell me ,why do we need a ‘‘Domain’’ here?
Thank you !