C# : Why is Line.TryCreateBetweenCurves(...) failing?

Hello
I tried your code on R7 and it works. Or I didn’t understood your problem . Are your arc on the same plane ?
arc arc line.gh (2.9 KB)

For one of my tool for rubber band I used that

And I use 4 methods in order to have the 4 possible solutions if they exist
image

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