Because Pi (π) has so many important uses, then we need to be able to start to calculate it, at least to several decimal places accuracy. To calculate pi a little bit more precisely, replace the red ball with one that is 100 times less massive than the blue ball – a ping pong ball might work, so we will call this the white ball. Then subtract 4 divided by 7. Pi is sometimes expressed as the fraction 22/7, but that is just an approximation. Several ways to compute Pi have been implemented in multiple languages if you want to compare across languages: Literateprograms has Machin's formula in five languages. Last Updated: November 8, 2020 wikiHow is where trusted research and expert knowledge come together. In the 19th Century William Shanks took 15 years to calculate Pi (π) correct to 707 decimal places. It’s pretty simple actually, to calculate Pi we can use this formula: Where n will be an infinity large and odd number, the more numbers you do the more accurate your calculation of pi will be, however, it will also take much longer! You need to add up more than 300 terms in order to produce Pi (π) accurate to two decimal places! a series is consist of infinite number of therms, as we use more terms of series, our Pi number will be more correct! Radius. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/8\/88\/1964913-1.jpg\/v4-460px-1964913-1.jpg","bigUrl":"\/images\/thumb\/8\/88\/1964913-1.jpg\/aid1964913-v4-728px-1964913-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

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\n<\/p><\/div>"}, Calculating Pi Using Buffon's Needle Problem, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/f\/f3\/Calculate-Pi-Step-8-Version-2.jpg\/v4-460px-Calculate-Pi-Step-8-Version-2.jpg","bigUrl":"\/images\/thumb\/f\/f3\/Calculate-Pi-Step-8-Version-2.jpg\/aid1964913-v4-728px-Calculate-Pi-Step-8-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

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\n<\/p><\/div>"}, Using Arcsine Function/Inverse Sine Function, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/4\/4f\/Calculate-Pi-Step-11.jpg\/v4-460px-Calculate-Pi-Step-11.jpg","bigUrl":"\/images\/thumb\/4\/4f\/Calculate-Pi-Step-11.jpg\/aid1964913-v4-728px-Calculate-Pi-Step-11.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

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