http://en.wikipedia.org/wiki/Lilavati

I noticed this at that page:

"Bhaskara II gives the value of pi as 22/7 in the book but suggest a more accurate ratio of 3927/1250 for use in astronomical calculations."

I also remembered reading somewhere that some ancient Indians had a simple formula for pi that was somewhat accurate; take the first 3 odd positive integers, twice each, as one single number, split it down the middle, and divide the right half by the left half, i.e. 113355 => 355/113 = ~pi.

So I checked, using Python:

$ python >>> from math import pi >>> pi 3.141592653589793

>>> print 3927.0/1250 3.1416

>>> print 355.0/113 3.14159292035

The approximation that uses 113355 matches pi (from Python) upto 6 decimal places.