Hi Richard,

Excel's precision is 15 significant digits.
If you need more, you might take a look at the XNUMBERS add-in:

http://digilander.libero.it/foxes/MultiPrecision.htm

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Kind regards,

Niek Otten

"Richard Lionheart" wrote in message
...
Hi All,

I demonstrating the approximation of Pi by successively computing the
perimeters of regular inscribed polygons with 2^n sides. Excel's
precision was overwhelmed at about 4000 sides.

Is there any way to get "double precision"? If worse comes to worse,
I'll use something like BigDecimal in Ruby or Perl to get greater
precision.
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Regards,
Richard