> -----Original Message----- > From: tclug-list-bounces at mn-linux.org > [mailto:tclug-list-bounces at mn-linux.org]On Behalf Of John J. Trammell > > On Thu, Jul 20, 2006 at 03:53:04PM -0500, Dan Drake wrote: > > The other day I learned that Ramanujan (a famous Indian > mathematician > > from the WWI era) had an expression that matched pi to 9 decimal > > places: > > > > (98.5 - 1/11)^(1/4) > > > > 97.5 perhaps? And I only get 8 decimal places. > Isn't a simple ratio approximation similar to the one 355/113 about that good ? That particular one is good to about 1 part per ten million (about 7 places) and is much faster in hardware !! Chuck