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in honor of tau the superior circle constant
]\tau = 6.283… = 2\pi[/latex]. And I cannot help but tell you about the glory ... [latex]r[/latex] (and so [latex]d/2=r[/latex]) we get
[latex]2\pi = \frac{2C}{d} = \frac{C}{d/2} = \frac{C}{r}[/latex].
And so [latex]2\pi