1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Hi Guest, welcome to the TES Community!

    Connect with like-minded education professionals and have your say on the issues that matter to you.

    Don't forget to look at the how to guide.

    Dismiss Notice


Discussion in 'Mathematics' started by stevencarrwork, Mar 6, 2012.

  1. Have you noticed that when you turn by a quarter of a circle, you turn by half a pi?

    Or the one that gets my students the most, a 3-quarter turn is 3pi/2

    This is because we have all been using the wrong value of pi, which is actually about 710/113

    http://www.math.utah.edu/~palais/pi.pdf explains further how we manage to miscalculate the value of pi
  2. PaulDG

    PaulDG Occasional commenter

  3. These is no suggestion that anyone miscalculated anything.

    This is a rather old idea.

    If you want to give 2pi another name you are free to do so. I'm going to go on calling it 2pi.
  4. A change to the definition of Pi - circunference/diameter - would sadly wreck one of the most remarkable results in mathematics: int(x^4 times (1-x)^4 / (1+x^2), x=0..1) = 22/7 - Pi.
    No change please.
  5. Nazard

    Nazard New commenter

    This cropped up lots in the press last June.(*)

    Here are some links for those who missed it:




    [* Why June? Well, in the bizarre US date-order-system the 28th June is 6/28, and apparently this is then appropriately rendered as 6.28 (rather than as a fraction). It's no more bizarre than insisting that 14th March is "Pi Day", I suppose. Still - it is nice to see that Wikipedia has 22nd July as "Pi Approximation Day" - because this at least puts the numbers in a good order and treats them as a fraction. 3.14 is, of course, an exact version of pi .... ]
  6. Karvol

    Karvol Occasional commenter

  7. Nazard

    Nazard New commenter

    I can't work out how to get smileys when using Chrome (getting the hyperlinks linked is fairly heroic!). I sort of relied on the "dotdotdot" to indicate sarcasm. Sorry if that caused confusion!
  8. Karvol

    Karvol Occasional commenter


  9. adamcreen

    adamcreen Occasional commenter

    definitely one from the green ink brigade, like the guy at Durham (or was it Reading) who "discovered" the value of 1/0 and reinvented the number system

Share This Page