Lv Chao (the world record holder of reciting pi) spent 24 hours and 4 minutes reciting pi to 67,890 decimal places without any mistakes in the recitation of1kloc-0/456 on October 20th, 2006, and when reciting pi to 67,890 decimal places, it happened to be ".

Thus, it set a new Guinness World Record for reciting error-free pi to 42 195 decimal places, which was created by a Japanese student friend Ji Yingzhe in 1995.

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Pi refers to the ratio of circumference to diameter of a circle, that is, pi = circumference ÷ diameter, which is generally expressed by the Greek letter π and is a common mathematical constant in mathematics and physics.

π is also equal to the ratio of the square of the area and radius of a circle, that is, π = the area of a circle ÷ radius 2 is the key value to accurately calculate the geometric shapes such as the circumference of a circle, the area of a circle, the volume of a sphere, etc. In the analysis, π can be strictly defined as the smallest positive number x satisfying sinx=0.

Pi is written in the Greek letter π (pronounced [pa? ]), which is a constant (approximately equal to 3. 14 1592654), is the ratio of circumference to diameter. It is an irrational number, that is, an infinite cycle decimal. In daily life, pi is usually expressed as 3. 14, which is used for approximate calculation.

3. The nine decimal places of141592654 are enough for general calculation. Even if engineers or physicists want to make more accurate calculations, they only need to take the values to a few hundred decimal places at best.

1665, the British mathematician JohnWallis published a mathematical monograph, in which he deduced a formula and found that pi is equal to the product of infinite fractions. 20 15 scientists at the university of rochester found a formula with the same pi in the quantum mechanical calculation of hydrogen atomic energy level.

On March 4th, 20 19, Google announced that pi has now reached 3 1.4 trillion digits after the decimal point. On 20021August 17, the American interesting science website reported that Swiss researchers used a supercomputer to calculate the famous mathematical constant pi to 62.8 trillion decimal places in 108 days, setting a record for the most accurate value of this constant so far.