Equal to 3. 14 1592654. Pi in Greek letters? π( 1 pronounced pài) is a constant, which is the ratio of circumference to diameter of a circle 4 102. Its 1653 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. The fractional part 3. 14 1592654 is 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.

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As far as Zu Chongzhi is concerned, π has reached seven figures. Modern scientists count π to different digits in various ways. Rudolph used his own life experience to count π to more than 30 digits, which was the proudest thing in his life. Machin, a mathematician who invented the fast algorithm, has counted π to more than 100, which is the first time that human beings have counted π to hundreds.

Finally, mathematical geniuses Florson and Ronchi calculated pi to more than 800 digits, and pi was gradually recognized by people and reached its peak. From 7 to 800, people's understanding of pi has deepened. But in the era of supercomputers, the calculation of pi can be said to increase exponentially.

The first American computer, ENIAC, calculated pi to several thousand digits or more. With the emergence of the information revolution, there has been a wave of computers in various countries, and computers are used to measure each other's comprehensive national strength. 1973, the American computer CDC7600 calculated pi to more than one million digits. Up to now, the number of digits in the calculation of pi is getting higher and higher.

Nowadays, supercomputers have calculated pi to trillions of digits, and the calculation of pi has new requirements for the intelligence and computing power of computers, which promotes the innovation of computers and the constant repair of bugs to some extent, and also promotes the improvement of computer technology by various manufacturers.