Mathematical constant \(\pi = \frac12\tau\), also known as Archimedes’ constant, equal to the length of a semicircle with radius 1, or equivalently the arc-length of a \(180^\circ\) angle [1].

The constant is stored at float64 precision, and its value is 3.141592653589793.

See Also

  • tau – mathematical constant \(\tau = 2\pi\);

  • math.pi – The \(\pi\) constant in the Python math module;