yes it's one of my favorites as well.......3.1415929203
The mathematicians Tsu Ch'ung-Chih and Tsu Keng-Chih (father and son), by means of calculations which have been lost, obtained an 'accurate' value of pi to ten decimal places, as 3.1415929203. The circle used for the inscribing of the polygons is known to have been 10 feet across. This value for pi was recorded in historical records of the period, but the actual books of those mathematicians have vanished over the centuries. Nine hundred years later, the mathematician Chao Yu-Ch'in (about 1300 AD) Set himself to verify this value of pi. He inscribed polygons in a circle with the enormous number of 16,384 sides. By this means he confirmed the value given by the Tsu family. The Tsu family had a lead in the computation of pi of about 1200 years. Even by 1600 AD in Europe, the celebrated calculation of the value of pi by Adriaen Anthoniszoon and his son only gave 3.1415929, an approximate value extending to seven places, which still fell three short of the value found by the Tsu family.
but I digress...........