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Thread: pi

  1. Sep 20th, 2002, 05:09 PM #1
    SilverSprite
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    pi

    Does anybody know the formula for finding the digits of pi?
    YL says:"Few are those who see with their own eyes and feel with their own hearts."(Einstein)
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  2. Sep 21st, 2002, 10:29 AM #2
    DavidHooper
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    Google for 'pi'. I'll give you some algorithms if you get stuck.
    There are 10 types of people in the world - those that understand binary, and those that don't.
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  3. Sep 21st, 2002, 10:30 AM #3
    SilverSprite
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    What do you mean google for pi?
    YL says:"Few are those who see with their own eyes and feel with their own hearts."(Einstein)
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  4. Sep 21st, 2002, 10:33 AM #4
    prog_tom
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    pi =

    3.14159265


    I forgot the fraction of PI... something like 27/7 or some crap.

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  6. Sep 21st, 2002, 10:33 AM #5
    SilverSprite
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    Pi is irrational and cannot be expressed as a fraction (rational number)
    YL says:"Few are those who see with their own eyes and feel with their own hearts."(Einstein)
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  7. Sep 21st, 2002, 10:34 AM #6
    DavidHooper
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    Go to www.google.com and type in 'pi'.
    There are 10 types of people in the world - those that understand binary, and those that don't.
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  8. Sep 21st, 2002, 10:36 AM #7
    The Hobo
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    Revised: pi = (A/2) / r ^ 2
    Last edited by The Hobo; Sep 21st, 2002 at 10:43 AM.
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  9. Sep 21st, 2002, 10:37 AM #8
    SilverSprite
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    What is A?
    YL says:"Few are those who see with their own eyes and feel with their own hearts."(Einstein)
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  11. Sep 21st, 2002, 10:38 AM #9
    The Hobo
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    Area of a circle.
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  12. Sep 21st, 2002, 10:39 AM #10
    SilverSprite
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    Oh yes i see where thats from but how does that help find the digits to pi? Like lets say i wanted to find the 1000th digit
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  13. Sep 21st, 2002, 10:41 AM #11
    The Hobo
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    That formula gives the digits of pi. Like you asked. Had you been specific in saying you wanted to find the nth digit of pi, perhaps I would not have given that formula.

    (Formula corrected in previous post)
    Last edited by The Hobo; Sep 21st, 2002 at 10:44 AM.
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  14. Sep 21st, 2002, 11:46 AM #12
    SilverSprite
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    Oh i'm sorry to disappoint you mr hobo? Trying to act all smart. What is the other formula then?
    YL says:"Few are those who see with their own eyes and feel with their own hearts."(Einstein)
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  15. Sep 21st, 2002, 12:56 PM #13
    siyan
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    3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706 7982148086513282306647093844609550582231725359408128481117450284102701938521105559644622948954930381 9644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412 7372458700660631558817488152092096282925409171536436789259036001133053054882046652138414695194151160 9433057270365759591953092186117381932611793105118548074462379962749567351885752724891227938183011949 1298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051 3200056812714526356082778577134275778960917363717872146844090122495343014654958537105079227968925892 3542019956112129021960864034418159813629774771309960518707211349999998372978049951059731732816096318 5950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473 0359825349042875546873115956286388235378759375195778185778053217122680661300192787661119590921642019 9
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  16. Sep 21st, 2002, 12:58 PM #14
    siyan
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    thats 1000 decimal places of accuracy

    this is an algorithm that takes exponentially longer when you increase the accuracy, so don't bother asking for like 2 billion or something

    although i know the millionth digit is a 5

    -C
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  17. Sep 21st, 2002, 12:59 PM #15
    SilverSprite
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    Do you know the algorithm?
    YL says:"Few are those who see with their own eyes and feel with their own hearts."(Einstein)
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  18. Sep 21st, 2002, 03:52 PM #16
    The Hobo
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    Originally posted by SilverSprite
    Oh i'm sorry to disappoint you mr hobo? Trying to act all smart. What is the other formula then?
    I never said I knew it.

    I answered your question. It's not my fault you gave the wrong one.
    My evil laugh has a squeak in it.

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  19. Sep 21st, 2002, 03:59 PM #17
    SteveCRM
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    sheesh people

    just type it into google!

    http://library.thinkquest.org/C01101...findingpi.html
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  20. Sep 21st, 2002, 04:51 PM #18
    visualAd
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    Originally posted by SilverSprite
    Pi is irrational and cannot be expressed as a fraction (rational number)
    How can one base so many mathematical phenomina on irrational numbers?
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  21. Sep 21st, 2002, 04:53 PM #19
    SilverSprite
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    right...
    YL says:"Few are those who see with their own eyes and feel with their own hearts."(Einstein)
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  22. Sep 21st, 2002, 04:58 PM #20
    A$$Bandit
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    Talking

    ... but if it was a rational number, the probability of it having an even denominator would be 1/3...

    Oh and the approximation is 22/7, but it's wildly inaccurate.
    Not at all related to sheep...
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  23. Sep 21st, 2002, 05:14 PM #21
    SilverSprite
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    And the approximation 211875/67441?
    YL says:"Few are those who see with their own eyes and feel with their own hearts."(Einstein)
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  24. Sep 21st, 2002, 05:29 PM #22
    visualAd
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  25. Sep 21st, 2002, 05:58 PM #23
    SteveCRM
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    my sentiments exactly
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  26. Sep 24th, 2002, 05:51 AM #24
    sql_lall
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    Talking hmm...

    just use the age old method of inscribing and exscribing (not the right word, i know ) n-gons inside a circle, to get Pi.
    It all boils down to something like this:
    x*sin(180/x) < Pi < x*tan(180/x)
    (in degrees- maybe it gets easier in radians- but radians use pi anyway)

    There is an infinite sum to find sin(x), but i'm not sure if there's one for tan(x). However, all u need to do is find limit (x*sin(180/x)), and this =Pi (i think)
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  27. Sep 30th, 2002, 03:02 PM #25
    JPicasso
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    any more places than about 5 or 6 and you need to measure in smaller increments.

    Try miles.

    I mean inches.... no wait, metric, metric, try picometers.
    Merry Christmas
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  28. Oct 2nd, 2002, 01:18 PM #26
    BanksySan
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    Talor Series

    You could use a Taylor Series to break down calc, but you would need to have a good idea of what your maximum accuracy should be.

    Otherwise, use an itrative meathod!
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