[AT] Supposedly why our old tractors are not metric and a fairly simple tutorial

[Henry Miller]

On of my math books had half a dozen different fractions you could use to get close. It is worth asking how close you need to be though. As I recall, 3 is good enough for anything in your house, 3.14 is good enough to get to the moon. 3.1415 will get you out of the solar system. 

-- 
  Henry Miller
  hank at millerfarm.com

On Fri, Mar 6, 2020, at 08:21, Carl Gogol wrote:
> The context I learned 22/7 was in high school math.  Lots of simple problems
> could be built around  it.  I have never heard of the 355/113 version.
> Carl
> Manlius, NY
> 
> -----Original Message-----
> From: AT <at-bounces at lists.antique-tractor.com> On Behalf Of Roger Moffat
> Sent: Thursday, March 5, 2020 8:34 PM
> To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com>
> Subject: Re: [AT] Supposedly why our old tractors are not metric and a
> fairly simple tutorial
> 
> 
> 
> > On Feb 25, 2020, at 9:58 AM, Stephen Offiler <soffiler at gmail.com> wrote:
> > 
> > Just a matter of significant digits.  22/7 is about 0.04% higher than the
> "true" value of pi.  That's pretty darn good for many practical purposes,
> but I wouldn't want to be calculating a moon launch with that kind of error.
> 
> An even more accurate, easy to remember value for pi is 355/113 (or 113
> divided into 355)
> 
> 22/7 = 3.14285714
> pi = 3.1415926535
> 355/113 = 3.14159292
> 
> Cheers
> 
> Roger
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