Machin's formula

proper noun

A formula for calculating the digits of pi: π/4=4 arctan 1/5- arctan 1/(239)

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Meanings

proper noun
  1. mathematicsA formula for calculating the digits of pi: π/4=4 arctan 1/5- arctan 1/(239)

Origin

Devised by astronomer John Machin.

Full word history & related roots →
Cite this entry
APA

Machin's formula. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Machin's%20formula

MLA

“Machin's formula.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Machin's%20formula. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “Machin's formula,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Machin's%20formula.

Source: Machin's formula on Wiktionary, CC BY-SA 4.0.