Rotate geometry

Good morning,
I have a question :
I want to rotate a geometry but to keep one of the point fixed.
Here for example, I want to rotate the surface but to keep the blue points as they were, at the orange point. I only want to move the line below: is there a way to do so?
Cheers,
Jules

Post. your. code.
Else define an axis at those points and use that axis for your rotation.

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