"Prometheus" wrote in message
...

That became apparent a little later in the thread. I was going to
throw the chord length in there, but I don't have a scientific
calculator handy, and I was too lazy to dig around on the net for the
value of sin(18)!

Of course, others nailed it, so there is no point in my posting it as
well.


The question required a bit of thought. I was going with the 11.3" until I
saw the other answers being lower and ended up solving the problem with a
drawing on AutoCAD.