#### Comment Preferences

• ##### Hey, pi=3 is a lot simpler(23+ / 0-)

..than that 3.14159 (sorry, that's all I've got memorized). Therefore we should use biblical geometry. Hexagonal wheels give a bit of a bumpy ride, though.

Cogito, ergo Democrata.

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• ##### heck, here's a 10-year-old(4+ / 0-)
Recommended by:
palantir, irishwitch, dopper0189, caul

doing 370 digits.

"Just because you win the fight, don't mean you're right," - Funkadelic

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• ##### "there's" (4+ / 0-)
Recommended by:
palantir, sawgrass727, irishwitch, caul

"Just because you win the fight, don't mean you're right," - Funkadelic

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• ##### I prefer....(3+ / 0-)
Recommended by:
caul, AlyoshaKaramazov, Mid10Dem

Kate Bush singing it.

....to 115 places

Free markets would be a great idea, if markets were actually free.

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• ##### just remember:(10+ / 0-)

Pi to 2 digits is good enough for most people, 5 digits will do for engineers. mathematicians might use 8, more than that and your just being an ass. :P

"There is one rule for the industrialist and that is: Make the best quality of goods possible at the lowest cost possible, paying the highest wages possible." -Henry Ford

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• ##### Personally, I only know pi to two letters:(6+ / 0-)

"pi". That's all it takes for Matlab to churn out more digits than I could ever want :-)

On a relate note: pi seconds is a nanocentury (To within less than a half a percent). For some reason that mnemonic has stuck with me...

• ##### Well I know pie to three letters(5+ / 0-)
Recommended by:
dopper0189, LeftyAce, Black Max, Bronx59, caul

and remember it involving Ginger and Maryann.

• ##### mmmmmm. I think I'll swap my pi out for your pie.(2+ / 0-)
Recommended by:
Quoth, caul
• ##### Actually, for engineers, pi=3 and pi^2=10(6+ / 0-)
Recommended by:
Sue B, Ender, caul, sixeight120bpm, pgm 01, Mathazar

are good approximations - within 5% for the first and within 2% for the second. Approximations like that let you do quick estimates of values without a calculator.

A lot of measurements aren't accurate to 2 or 3 digits, or variability of materials or components is worse than 5%, so higher precision can be meaningless.

But engineers also know the difference between an approximation and the actual value of pi, too.

Modern revolutions have succeeded because of solidarity, not force.

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• ##### You don't have to work to decimal digits(1+ / 0-)
Recommended by:
sixeight120bpm

when you can get better approximations faster using unit fractions. Kevin Brown's work on them at Stanford can be found online.

Live Free or Die --- Investigate, Incarcerate

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• ##### And I am an engineer! n/t(0+ / 0-)

Cogito, ergo Democrata.

[ Parent ]

• ##### "i wish i could recollect pi easily today"(1+ / 0-)
Recommended by:
caul

that's the mnemonic for remembering the first 8 digits of pi:  3.14159265

Politics is like driving. To go backward put it in R. To go forward put it in D.
Drop by The Grieving Room on Monday nights for support in dealing with grief.

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• ##### Biblical science fascinated Newton(2+ / 0-)
Recommended by:
Dave in Columbus, Ahianne

Whose ideas about gravity led to Einsteins theory of relativity. The bronze sea and the temple of Solomon are among a number of fairly sophisticated math problems that don't just give PI but also PHI and all the "sacred geometry" that led people like Galileo to try to rediscover the properties of things like the pendulum.

Egyptian Circle

My favorite is the unit fraction formula an architect at Saqarra used c 3000 BC to approximate the value of Pi for an arch using what amounts to analytic geometry.

Any workman knows he can use 3 plus 1/8 plus 1/64 ``` 3.140625 as an easy approximation to the limits of our ability to measure with simple tools.```

```We know the rough approximation of PI```~ 22/7 = 3.1428571428571428571428571428571 was used in Mesopotamia and
PI= ~355/113 = 3.1415929203539823008849557522124 in ancient Egypt along with the
PI=~256/81= 3.1604938271604938271604938271605  used in the Rhind Papyrus but the formula at Saqarra which comes out at
Pi = ~3.1396823625730136383805459372223 C 3000 bc is not bad.

Live Free or Die --- Investigate, Incarcerate

[ Parent ]

• ##### Egyptian fractions(2+ / 0-)
Recommended by:
Ahianne, wilderness voice

For example, they didn't say 7/8, but instead 1/2+1/4+1/8.

"...to name something is to own it." Thomas L. Friedman. Pleonexia. Ruthless self-seeking. An arrogant assumption that others and things exist for one's own benefit. I now own the Republican Party.

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• ##### Unit Fractions(3+ / 0-)

were used in Egypt but continued in use through the middle ages and are being rediscovered by mathematicians today.

Instead of expressing them with numerator and denominator the notation 1-'8 = '2,'4,'8 can be used.

Their use in architectural proportions, modulors and standards of measure so as to make units commensurate in four or more dimensions eventually resulted in Elizabeth 1 of England changing the length of a mile so that there were twice as many seconds in a century as inches in the circumference of the earth making navigation much easier.

Live Free or Die --- Investigate, Incarcerate

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