Q. Who first calculated the value of π?

Correct Answer: (A) Archimedes

Explanation: Archimedes, the ancient Greek mathematician, is credited with being the first to calculate an accurate approximation of the value of π (pi). He used a geometric method involving inscribed and circumscribed polygons to estimate the value of π as being between 3.1408 and 3.1429. This was a significant achievement in mathematics and laid the foundation for future studies of π. While other mathematicians like Aryabhatta and Pythagoras contributed to mathematics, Archimedes’ work on π is particularly notable.