Archimedes was a brilliant mathematician who lived in ancient Greece thousands of years ago. His impressive accomplishments include discovering a groundbreaking technique to approximate Pi, which is still used today.

Archimedes' technique involved inscribing a hexagon in a circle and doubling the number of sides with each iteration. By calculating the perimeters of these polygons, he was able to determine Pi's value with remarkable accuracy.

Archimedes continued this process until he reached a 96-sided polygon. The increasing complexity of calculations made it impractical to go further by hand.