If the diameter of a circle is 1 then its circumference is pi. The value of pi 3.1415926535897932384626433832795028841971693993751058209749445 923078164062862089986280348253421170679821480865132823066470938.... The earliest evidenced conscious use of an accurate approximation for the length of a circumference with respect to its radius is of 3+1/7th in the designs of the Old Kingdom pyramids in Egypt. Until the second millennium, it was known to fewer than 10 decimal digits.
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No. Pi is a set number, if it were negative (-3.14159...) it would not represent the ratio of radius to circumference.
The symbol π was popularized by the Swiss mathematician Leonhard Euler in the early 18th century to represent this ratio.
(pi)(1/pi)=1.4396 ...
"Pi" is an irrational number. No series of digits can represent its value exactly, whether written as a fraction or as a decimal. The decimal can be extended to any number of significant figures, no matter how large, and never ends.
the same as pi squared, which is 9.86960440109