1. In daily life, pi is usually expressed as 3. 14 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.
π is the lowercase of the 16th Greek letter. The symbol 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.
Extended data:
1. 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. 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 the universe, the error is less than the volume of an atom.
2. The International pi day can be traced back to1March 4, 988/KLOC-0, written by physicist Larry of the San Francisco Science Museum.
Xiao, who organized museum staff and participants to make three 1/7 circles around the museum monument (22/7, one of the approximate values 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.
3. In 2009, the U.S. House of Representatives formally passed a non-binding resolution to designate March 14 as "pi day" every year. The resolution holds that "because mathematics and natural science are interesting and indispensable parts of education, and learning π is a fascinating way to teach children geometry and attract them to learn natural science and mathematics ... π is about 3. 14, so March 14 is the most appropriate day to commemorate pi day."
References:
Baidu encyclopedia _ π