me
archimedes
Charriere
No one, it is a physical property of a circle.
Actually, Eratosthenes of Cyrene (276? - 195? B.C.) was the first to calculate the Earth's circumference accurately. He is supposed to be the inventor.
Pi is the relationship between the diameter and the circumference of a circle.
Pythagoras invented the theorem and gave us the relationship between the radius and diameter of a circle to it circumference.
pi is a transcendental number which represents the constant ratio between the circumference of a circle and its diameter. It is a universal constant and nobody invented it.
It was not invented but discovered by ancient mathematicians who found that the circumference of any circle when divided by its diameter is always the same ratio for any circle.
Archimedes, a famous Greek mathematician, born about 287 B.C.
He invented the system of longitude and latitude.He was too the first person who calculate the circumference of the Earth.
Because it was found that there was a direct relationship between the radii (or diameters) of circles and their circumferences.