Hi all, I've been doing other things for a while now, but a problem one of my best mates was having got me thinking about card modeling again and, try as I might, I can't wrap my head around this. The item is a cone-shaped lamp shade. To my mind, a lamp shade is two circles of differing diameters separated by a vertical distance, so there must me some mathematical way to convert those circles into an arc to 'flatten' the cone from a 3D object to a 2D pattern. The problem is, try as I might, I can't figure this one out! Can anybody help me here? Cheers & Thanks in advance!