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Constant std::f64::consts::PI

pub const PI: f64 = 3.14159265358979323846264338327950288f64

Archimedes' constant (π)

© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/f64/consts/constant.PI.html