Pi was not invented by one person, but was calculated by different mathematicians through countless times in the course of history. Archimedes, a great mathematician in ancient Greece, initiated the theoretical calculation of the approximate value of pi in human history. Around 480 AD, Zu Chongzhi, a mathematician in the Northern and Southern Dynasties, first calculated "pi" to the seventh place after the decimal point.

17 At the beginning of the 5th century, the Arabic mathematician Cassie got the exact decimal value of pi17, which broke the record kept by Zu Chongzhi for nearly a thousand years. German mathematician Ludolph van ceulen calculated π to 20 decimal places in 1596, and then calculated π to 35 decimal places in 16 10, and named it Rudolph number after him.

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Pi is represented by the Greek letter π, which is a constant (approximately equal to 3. 14 1592653) and represents 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. However, it is generally enough to calculate the decimal places of 3. 14 1592653. Even if engineers or physicists want to make more accurate calculations, they only need to be accurate to hundreds of decimal places.

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 Hubble volume is calculated with 39-bit precision pi, the error is less than the volume of an atom. People used to calculate pi in order to explore whether pi is a decimal cycle.