Rotation problem

Hii! I’m trying to rotate each curve arround the perpendicular line between the small polygon and the big one. Im having trouble doing this… Hoping someone can help me with this simple question
pilar2.3dm (220.6 KB) (16.3 KB)

Try with Flow (23.5 KB)

THANK YOU SO MUCH!!! this was very helpful im still a noobie so thank you so much for taking the time and teach me ;3