add4 t0 100 ,multiply with 8 and then add 62000 (ie) 62832 and divide it to 20000
(ie) 62832/20000 =3.1416
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pi is the constant value that was given by ARYABHATTA was 3.141 and here "r" is nothing but radius
pi = 4/1 - 4/3 + 4/5 - 4/7 ...
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actually pi existed thousands of years ago the first reference comes from the vedas which tells pi divided by ten accurately to 15 decimals. in 2500 to 3000 bc.then babylonians,egyptians,greeks,indians,e.t.c have approximately found the value of pi.archimedes told that pi lies between 3.1429 and 3.1408.aryabhata describes pi as 3.1416.indian mathematical genius ramanujam has invented a formula for pi,using this pi's value can be found correctly to billion decimals.recently in 2010 a super computer using his formula calculated pi to 10.6 trillion decimals.
The evolution of computer technology allows us to calculate the value of pi to an ever-increasing number of decimal places. In 2010 a computer in China calculated pi to 5 trillion decimal places.