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The number τ (/ˈtaʊ, ˈtɔː, ˈtɒ/ ⓘ; spelled out as tau) is a mathematical constant that is the ratio of a circle's circumference to its radius. It is exactly equal to 2π and approximately equal to 6.283185.
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circle circumference constant radius used tau 2π ratio letter symbol turn defined hartl mathematical 28 number angle use using pi
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Tau (mathematics) | Algebraic form | 2π | 1.00 | infobox |
| Tau (mathematics) | Decimal | 6.28318531... | 1.00 | infobox |
| Tau (mathematics) | Rationality | irrational | 1.00 | infobox |
| Tau (mathematics) | Symbol | τ | 1.00 | infobox |
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