. How is the transcription and rotation method?!

In this video, the designer cut the shape by copying it with rotation and then subtracting … But how do you work if the required shape is oval … How is the transcription and rotation method? !!

Like this for example

More explanation of what I mean (the rotation is around the axis in a circular direction … The shape here is oval…how can the rotation process be done

@Soso
I have responded to your other post at:

https://discourse.shapr3d.com/t/please-see-my-topic-and-help-me/6421/2