The person who first discovered pi was a mathematician named William Jones in 1706. Jones was a close friend of Issac Newton. Jones was from Wales.
http://www.ask.com/webanswers/Science/Mathematics...

Archimedes.
http://wiki.answers.com/Q/Who_was_the_first_person...

According to most mathematics scholars, Archimedes was the first person to
http://www.chacha.com/question/whowasthefirstp...

That the ratio of the circumference to the diameter of a circle is the same for all circles, and that it is slightly more than 3, was known to ancient Egyptian, Babylonian, Indian
http://answers.yahoo.com/question/index?qid=200802...
