The abbreviation of π is 3. 14. ? π? What is worth it is the ratio of the circumference to the diameter of a circle. 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.

International pi day:

20 1 1 year, the International Mathematical Association officially announced that March 14 every year would be designated as the International Mathematics Festival, which originated from the pi of Zu Chongzhi, an ancient mathematician in China. ?

Pi day can be traced back to1March, 98814th, a physicist at the Science Museum in San Francisco, Larry Shaw. He organized museum employees and participants to make 3 and 1/7 laps around the museum monument (22/7, one of the approximations of π) and eat fruit pies together. Later, the San Francisco Science Museum inherited this tradition and held a celebration on this day every year.