Constant creusot_contracts::std::f128::consts::FRAC_2_PI

pub const FRAC_2_PI: f128 = 0.636619772367581343075535053490057448137838582961825794990669_f128; // 0.636619772367581343075535053490057474f128

🔬This is a nightly-only experimental API. (f128)

2/π