circumference/diameter
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the value of pi can be derived as the ratio between the circumference and diameter of every circle, say pi = circumference/diameter
The area of the base of a cylinder = Pi times Radius squared. Diameter of a cylinder = 2 times Pi times Radius. To find the diameter derive the area of the base by Pi and then square root the answer. That will give you the value of the radius. Multiply that answer by 2 times Pi and you will have your answer.
The value of Pi is 3.14 so the value of Pi by 2 is 6.28.
The value for Pi for math is 3.14. Pi is the 16th letter in the Greek alphabet.
Archimedes estimated the correct value of pi