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

1. ### stevencarrwork

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

3. ### Anna-Luise

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. ### Polecat

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.

5. ### NazardNew commenter

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

Here are some links for those who missed it:

www.bbc.co.uk/news/science-environment-13906169

tauday.com

thepimanifesto.com

[* 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 .... ]

Er...

7. ### NazardNew 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!