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Aryabhata
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Approximate Value of Pi

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        Aryabhata calculated the approximate value of pi to four digits. He calculate pi to be 3.1416, close to 3.14159. Aryabhata found the approximate value by adding 4 to 100 then multiplying it by 8 and adding 62,000. The total for that was 62832, he divided that number by 20,000. The number he got, 3.1416, was equal to the circumference of a circle with a diameter of twenty-thousand. He calculated this value all by himself and he also realized that pi is an irrational number. All his calculations are written in his books. 
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