tau (Q2333151)
ratio of the circumference of a circle to its radius
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other details
aliases τ
 2π
 6.28
 6.283185307179586...
 2pi
 two pi
description ratio of the circumference of a circle to its radius

External Links
(P829) A019692
(P2671) /g/122c6403
(P6900) τ(数学定数)
(P8885) 타우(수학)
(P12888) df-tau