On Sun, Dec 18, 2016 at 9:10 AM, Jon Lagerquist via Stagecraft <stagecraft at theatrical.net> wrote: > So for an ellipse with a size of 10 x 8 the focus is: > > Sqrt(5^ - 4^2) = Sqrt(25 - 16) = Sqrt(9) = 3 > > And the string is > > 2*(5+3) = 16 "I was told there would be no math..." -- Jon Ares www.arescreative.com http://backstagethreads.com