Lots of scientists have worked on evaluating pi. The question needs to be a little ,ore specific.
Archimedes estimated the correct value of pi
Archimedes
The value of pie calculated by first Indian scientist Baudhayana
Lots of people did this; the accuracy increased over time.
The Romans gave a value of 3.1416 to pi. This was given around 150 AD by a Greek-Roman scientist Ptolemy. It is believed that he might have obtained the value from Archimedes or Apollonius who had accomplished works in the field.
The value of Pi is 3.14 so the value of Pi by 2 is 6.28.
There have been many estimations of Pi by many scientists over the years. To answser this questions, more information is needed. You might also see the link on the history of Pi.
The value of pi (Ï€) is3.1415926535897932384626433832795028841971693993751.........
The approximate value of pi is 3.14159265.
You get the value of pi by dividing the circumference with the diameter of a circle. pi = c/d
The value for Pi for math is 3.14. Pi is the 16th letter in the Greek alphabet.
No one has fully discovered pi. Pi is believed to be irrational.