6. Who calculated pi first? A. Ramanujan B. Archimedes C. Van Ceulen D. Lambert

Archimedes is often credited as one of the first to calculate an accurate approximation of pi around 250 BC using a geometric approach. By inscribing and circumscribing polygons around a circle and calculating their perimeters, he determined that pi is approximately 3.14, laying a foundational stone for future calculations. Fast forward to the late 16th century, and you meet Ludolph van Ceulen, who devoted his life to calculating pi to 35 decimal places! His dedication was so immense that the number was inscribed on his tombstone, showcasing the historical significance of this mathematical quest. Talk about a commitment to the circle!