This site gives the history of pi. Hope you find your answer. http://members.aol.com/purseweb/calc.html
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All numbers are unique and so there is no other number equal to pi. Pi is not a rational number so there is no fraction that is equal to pi. It has an infinitely long non-recurring decimal representation so there is no way to write a decimal eqiuvalent either.
The circumference of any circle divided by its diameter is always equal to pi which is about 3.142 rounded to 3 decimal places. The exact true value of pi is not known because the decimal places of pi are infinite.
Pi can't be exactly expressed as a fraction, or as a decimal. It is approximately equal to 3.14159265, but for many practical calculations you may want to round it to 3.14, or to 3.1416.
The 1,000th decimal of Pi is 9.
it can't be expressed as a fraction. the numbers after the decimal go on and on without end. No fraction can be divided to equal pi, therefore, it's irrational.