pi
constant ratio of the circumference of a circle to its diameter
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Summary
pi is a transcendental number[1]. pi ranks in the top 8% of transcendental number entities by monthly Wikipedia readership (64,247 views/month).[2]
Key Facts
- Instance of: real number[3], mathematical constant[4], UCUM constant[5], ratio of lengths[6]
- Named after: circle[7], Ludolph van Ceulen[8]
- Commons category: Pi[9]
- Unicode character: π[10]
- Topic's main category: Category:Pi[11]
- Notation: pi[12]
- Approximation algorithm: Gauss–Legendre algorithm[13], Borwein's algorithm[14], Leibniz formula for π[15], Kochański's approximation[16], Chudnovsky algorithm[17], Bailey–Borwein–Plouffe formula[18], Wallis product[19], Machin-like formula[20], Zhao Youqin's π algorithm[21]
- Numeric value: 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938[22], 3.14[23], 4[24]
- Described by source: ISO 80000-2:2019 Quantities and units — Part 2: Mathematics[25], Great Soviet Encyclopedia (1926–1947)[26]
- Stack Exchange tag: https://stackoverflow.com/tags/pi[27]
- Different from: Pi[28], Pi greco[29], Pī[30]
- TeX string: \pi[31]
- History of topic: chronology of computation of π[32]
- Name: π[33]
- Hashtag: π[34]
- Studied by: mathematics[35]
- Permanent duplicated item: Q114451702[36]
- Significant person: William Jones[37]
- On focus list of Wikimedia project: Wikipedia:List of articles all languages should have[38], Wikipedia:Vital articles/Level/4[39]
- Less than: 22/7[40]
- Maintained by WikiProject: WikiProject Mathematics[41]
Body
Influence
Things named for pi include Pi Day[42], an awareness day[43], founded in 1988[44]; PiHex[45], a software[46]; Super PI[47], a computer program[48], founded in 1995[49]; and 314159 Mattparker[50], an asteroid[51].
Why It Matters
pi has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[52] pi is known by 101 alternative names across languages and contexts.[53]
Entities named for pi include Pi Day[42], an awareness day[43], founded in 1988[44]; PiHex[45], a software[46]; Super PI[47], a computer program[48], founded in 1995[49]; and 314159 Mattparker[50], an asteroid[51].