too many.
http://wiki.answers.com/Q/How_many_digits_of_pi_ha...

Pi has now been calculated to more than 200,000,000,000 digits, but the exact
http://www.chacha.com/question/howmanydigitshas...

π (sometimes written pi) is a mathematical constant whose value is the ratio of any circle's circumference to its diameter in Euclidean space; this is the same value as the ratio
http://askville.amazon.com/AnswerViewer.do?request...

like more than 45,000. Source(s) pi day at school.
http://answers.yahoo.com/question/index?qid=201103...
