They used a computer at the University of Tokyo.
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The calculations were performed using a HITACHI SR8000/MPP supercomputer at the Department of Information Science at the University of Tokyo in Tokyo.
3.141592654 rounded by the calculator
You take the circumference of a circle and divide it by the diameter.
The most accurate calculation of pi is currently estimated to be around 31.4 trillion decimal places. This calculation was achieved using supercomputers and advanced mathematical algorithms. However, for most practical purposes, using pi to just a few decimal places (3.14159) is sufficient.
The circumference of a circle when divided by its diameter is the value of pi which is an irrational number that can't be expressed as an exact fraction.
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