From 1e81067b074c990a031b1b8c9b658ecbdc22dcb3 Mon Sep 17 00:00:00 2001
From: Franklin Chen <franklinchen@franklinchen.com>
Date: Fri, 23 Jun 2017 18:46:37 -0400
Subject: [PATCH] Add tau.

---
 src/Math.js   | 2 ++
 src/Math.purs | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/src/Math.js b/src/Math.js
index f225f3a..9041361 100644
--- a/src/Math.js
+++ b/src/Math.js
@@ -74,6 +74,8 @@ exports.log10e = Math.LOG10E;
 
 exports.pi = Math.PI;
 
+exports.tau = 2 * Math.PI;
+
 exports.sqrt1_2 = Math.SQRT1_2;
 
 exports.sqrt2 = Math.SQRT2;
diff --git a/src/Math.purs b/src/Math.purs
index 4f62e85..a8f2516 100644
--- a/src/Math.purs
+++ b/src/Math.purs
@@ -87,6 +87,9 @@ foreign import log10e :: Number
 -- | The ratio of the circumference of a circle to its diameter, around 3.14159.
 foreign import pi :: Number
 
+-- | The ratio of the circumference of a circle to its radius, around 6.283185.
+foreign import tau :: Number
+
 -- | The Square root of one half, around 0.707107.
 foreign import sqrt1_2 :: Number