Archimedes estimated the correct value of pi
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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 for Pi for math is 3.14. Pi is the 16th letter in the Greek alphabet.
the value of pi can be derived as the ratio between the circumference and diameter of every circle, say pi = circumference/diameter
pi is approximately equal to: 3.141592653589793238462643383279...