It is unknown and it usually just represented as pi.
It represents the ratio between the circumference and the diameter.
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If you mean "the value of pi rounded to the nearest hundredth," then: 3.14
The longest known value of pi is now into the hundreds of billions of digits.
5.97
It is: pi = 3.14 in two decimal places
At around 1900 B.C., Egyptians estimated the value of pi to be 256/81.