How can I get the sloping line of the roof?

There is a roof that is in a single plane. How do I get the slope defined line on this roof?

I have a topic you can see way to find slope : Relationship Linear Regression With Pipe Slope | Hồ Văn Chương

I think you misunderstood. I want to get the line where the slope starts on the roof from the dynamo.

edit: wrong track
For a plane inclined by 3 points
Green line: Toggle line
Red line:
one of the slope lines from the highest point of the plane


there is already existing roof. I click on the edit footprint of this roof. Here are the sketchlines of the roof. One of them has a slope defined. How can I get this sketchline as line in Dynamo?

Here to recover the curves of the roof


12 février forum anglais_rep3.dyn (28.7 KB)


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