According to Joy of Pi, the value of pi to 100 decimal places is expressed as 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679. Pi is an irrational number with a limitless, nonrepeating decimal expansion.
Pi is a constant that represents the ratio of a circle's circumference to its diameter. Despite the constant being a ratio, it is irrational, and, therefore, a nonrepeating number. It has a limitless number of decimals. As of October 2011, a Japanese mathematician and systems engineer, Shigeru Kondo, calculated pi out to its first 10 trillion digits. This broke a previous world record of 5 trillion digits calculated by Kondo just one year earlier.
3.141593 is best I can remember. 3.14159265 is a little better. (Chuck Baggett)
http://wiki.answers.com/Q/What_is_the_value_of_pi_...

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The square root of pi is
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