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The most commonly used - and highly accurate one - is 3.1415926. Pi is an irrational number. There is no "exact" answer. Each place to the right of the decimal makes it more precise, and closer to the absolute, but you'd never reach the absolute - it doesn't exist (irrational number).

Even for modern engineering purposes, 3.1415926 is generally close enough for excellent results.

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Q: What is the exact calculations of pi?
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