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# why does pi and 3.14 have different answers?

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why does pi and 3.14 have different answers?

Guest May 18, 2014

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I bought Petr Beckmann's "A History of Pi" on my first visit to the US (a large number of years ago!) and still have it.  A fascinating book, not least because of Beckmann's writing style!  It still seems to be available on Amazon.

Alan  May 19, 2014
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Because 3.14 is just a rounded version of pi (to 2 decimal places).

So pi is actually 3.14159265...etc. when 3.14 is just pi rounded to 2 d.p.

Guest May 18, 2014
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the most of pi that I know is 3.14159265358979323

Guest May 18, 2014
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pi is an irrational number and cannot be expressed as a fraction or as a decimal.  When expressed as  a decimal the digits keep going for ever without any pattern.  Hence whenever it is expressed as a fraction or a decimal it is always an approximation.

This may be of interest to some people it is from Wikipedia.

Pi can be calculated in ta number of ways.  Here are a couple.

Melody  May 19, 2014
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I have put the address for this thread in the sticky note labeled

"Information pages worth keeping or developing"

Melody  May 19, 2014
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Very interesting what Melody said......there is a book by Petr Beckmann entitled "A History of Pi". I don't know if it is still in print, or not, but it is quite fascinating. However, the last half of the book requires some fair knowledge of upper maths!!

One funny note....Many years ago, The State Legislature of Indiana in the US once tried to "legislate" the value of pi!!! Go figure....

CPhill  May 19, 2014
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Legislate pi, really!

Now that is funny!

Indiana "Pi" bill
http://en.wikipedia.org/wiki/Indiana_Pi_Bill

Melody  May 19, 2014
#7
+26402
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I bought Petr Beckmann's "A History of Pi" on my first visit to the US (a large number of years ago!) and still have it.  A fascinating book, not least because of Beckmann's writing style!  It still seems to be available on Amazon.

Alan  May 19, 2014
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Thanks, alan....I didn't know if it was still in print, or not....I made it about halfway through the book....but I don't have enough math knowledge for some of the rest of it.....The interesting thing to me is that the "chase" for pi seemed to produce some rather interesting things in other areas, too!!

CPhill  May 19, 2014

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