Multiple choice Ancient Greek mathematician who defined the value of II (Pi) is Euclid Archimedes Pythagoras Aristotle Reveal answer Fill a bubble to check yourself B Correct answer Explanation Archimedes calculated the value of pi (π) as 223/71 < π < 22/7. Euclid founded geometry, Pythagoras discovered his famous theorem, and Aristotle was a philosopher, not known for calculating π.