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Thread: Finding Pi

  1. Feb 14th, 2003, 05:00 PM #1
    SteveCRM
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    Finding Pi

    As popular as i figured this would be, search didn't find anything!

    I found this online on how to find n digits of pi

    Pi = SUMk=0 to infinity 16-k [ 4/(8k+1) - 2/(8k+4) - 1/(8k+5) - 1/(8k+6) ]

    I thought I knew how to use it until i tested it out manually on my calculator and got some funky answer. Has anyone seen this before? How is it used? (heh i thought i knew )

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  2. Feb 15th, 2003, 05:51 PM #2
    alkatran
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    I was at my dad's house (no internet ) and I needed to find pie to a few more digits then I knew..

    I just put 2 points, using arcsin to find them. Whenever teh angle went above X, I knew I had gone too far, backed up one, went to next digit, etc... I got it correct up to about 12 digits... then it went beyond the capabilites of QBasic lol (It started doing it in scientific notation, which didn't give more info.
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  3. Feb 17th, 2003, 01:45 AM #3
    Jim Brown
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    Easiest way to get Pi is 4*arctan1 (in radians btw)
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  4. Feb 17th, 2003, 04:19 PM #4
    bugzpodder
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    i'll invent my own pi algorithms. we know that sinpi/6=1/2
    so pi=6*arcsin(1/2) in radians of course

    also you can get a random set of numbers, the chances of pairs being relatively prime is 6/pi^2
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    The probability that a random rational number has an even denominator is 1/3 (Salamin and Gosper 1972)? This result is independently verified by me (2002)!
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