I am trying to put holes every 13 deg on an acr. I can unfold the part first but my dimension on print are every 13 deg and when in the flat I don't have the dimensions? I guess I could figure out the length of the 13 deg arc but if I need to change my K factor later my arc length in the flat will change so I'm not sure this is the best way to handle this?
I have attached the part with no holes if anyone can help that will be great!

Thanks, Chris