1. No one is certain who discovered pi as we know it today
But we do have some ideas. It seems that the Egyptians used pi in the construction of the Great Pyramid because when the perimeter is divided by its height, one gets a close approximation to 2π. It’s the same result if one divides the circumference of a circle by its radius.
But the most significant pi research might have come from the astronomer, Archimedes, around 250 B.C.
His mathematical calculation showed that pi was between three and one seventh and three and 10 seventy firsts,” Steven Strogatz, an applied mathematics professor at Cornell University, told NBC Owned Television Stations. “He approached that putting a six sided figure into a circle, then made it 12 sided, and went all the way up to a 96-sided polygon.”