2.π is approximately equal to 3. 14 1592654.
3. pi in Greek letters? π (pronounced pài) is a constant (approximately equal to 3. 14 1592654), which is the ratio of circumference to diameter.
4, it is an irrational number, that is, infinite acyclic 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 calculate more accurately, they only need to take the value to several hundred decimal places at best.
Extended data:
Pi day is on March 14 every year, and the "ultimate pi day" is 1592 at 6: 54 on March 14, (because its English notation is "3/15926.54". ) and 3141May 9 at 2: 06: 05 (from beginning to end 3. 14 159265).
July 22nd is the approximate date of pi (the date in Britain is recorded as 22/7, which is regarded as the approximate fraction of pi).
Some mathematicians think that "true pi" should be defined as 2π and recorded as τ (pronounced tau).
On March 4th, 20 19, Google announced that EmmaHarukaIwao, a former Japanese Google engineer, with the help of Google's cloud platform, calculated pi to 3 1.4 trillion digits after the decimal point, or 3 14 15926535897 digits, rather than 20657 digits.
It is understood that Emma's team used a program called ycruncher, which can calculate π to several trillion decimal places. The program is driven by 25 virtual machines running on the computing engine of Google Cloud Platform.
PeterTrueb, the creator of 20 16 record, was calculated by computer. This calculation requires data of 170TB, which is roughly equivalent to all the printed collections of the Library of Congress. It took Emma about four months to break the previous world record.
Baidu Encyclopedia-π