# What is the most proper approximation for function Pi

In science and engineering, the function Pi is sometimes necessary in calculation. What is the most up to date, proper approximation for this function. Does the approximation at:

http://www.math-solutions.org

good enough if I use it in my calculation? Does someone has a better approximation for the function?

http://www.math-solutions.org

good enough if I use it in my calculation? Does someone has a better approximation for the function?

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