π is the lowercase of the sixteenth Greek letter. π is also the first letter of Greek π ε ρ φ ρ ε ρ α (meaning periphery, region, circumference, etc. ).

1706, the British mathematician William Jones (1675- 1749) first expressed pi. 1736, the great Swiss mathematician Euler also began to express pi. Since then, π has become synonymous with pi. Be careful not to mix π with its capital π, which means multiplication.

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In the past, people calculated pi to explore whether pi circulated decimals. Since Lambert proved that pi is irrational in 176 1 and Lin Deman proved that pi is transcendental in 1882, the mystery of pi has been uncovered. π plays a very important role in many fields of mathematics.

It is of little practical significance to calculate the value of pi so accurately. A dozen pi values used in modern science and technology are enough. If the value of pi with 39-bit precision is used to calculate the size of hubble volume, the error is less than the volume of an atom.

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