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pi is a universal constant. It is a transcendental number which is a special kind of irrational number. It cannot be expressed as a terminating or repeating decimal, nor as a ratio of integers or surds.

There are various ways in which pi can be calculated and expressed. Commonly used approximations are 22/7, 3.14, 3.14159.

Last year pi was calculated to 5 trillion digits although 40 digits are thought to be sufficient to calculate the angle subtended on earth by a hydrogen atom at the far end of the known universe!

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13y ago

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