Creating an Edge on Existing Surface

I have this surface that I split with an arc shape. I then deleted said shape, so all i have is this surface with no edges.

I would like the edge of the top of the arc so that I can use it elsewhere, and when I try to redraw the arc I can’t get it to be exactly the same size/shape.

Is there a way to creat an edge out of the surface that will be exact?

so ?

This is German, but u will find it.

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If you just need the edge curve from the surface, you can use DupEdge or DupBorder commands.
The edge curves are part of the surface NURBS definition.

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thank you!!

thank you!!!

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