What is the ealiest known reference tp pi in history in 1352?

Answer 1

The earliest known reference to pi dates back to ancient civilizations, but a notable mention in 1352 refers to the work of the Persian mathematician Ibn al-Haytham (Alhazen), who contributed to the understanding of pi through his studies in optics and geometry. However, pi itself had been approximated by various cultures long before this, with the Babylonians and Egyptians estimating its value around 3.125 and 3.16, respectively. The symbol for pi (π) was later introduced by the Welsh mathematician William Jones in 1706, but the concept has deep historical roots.