Answer:
To calculate the circumference of a circle, multiply the diameter of the circle with π (pi). The circumference can also be calculated by multiplying 2×radius with pi (π=3.14).
Inventor:
Eratosthenes
Archimedes is credited with the formal discovery of Pi in 240 B.C.E. in Greece, and Eratosthenes was the first person to calculate the circumference of the earth accurately, sometime between 276 and 195 B.C.E.
