From 901d77d1ca324995c55e957b9b2f52464624d5ab Mon Sep 17 00:00:00 2001 From: David Mc Cormack Date: Thu, 21 Mar 2019 16:06:31 +0000 Subject: [PATCH] Description added (#28039) Basic description of a Unit Circle added as well as a link to a wiki article --- guide/english/mathematics/unit-circle/index.md | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/guide/english/mathematics/unit-circle/index.md b/guide/english/mathematics/unit-circle/index.md index e41c7e205c..ae985a95de 100644 --- a/guide/english/mathematics/unit-circle/index.md +++ b/guide/english/mathematics/unit-circle/index.md @@ -3,13 +3,10 @@ title: Unit Circle --- ## Unit Circle -This is a stub. Help our community expand it. +A unit circle is a circle with an r (radius) of value 1. It is frequently used, centered at coordinates 0,0, in the cartesian coordinate system as a part of trigonometry. -This quick style guide will help ensure your pull request gets accepted. - - - -#### More Information: - +The interior of a unit circle, not including the outer circle, is called the open unit disk, when the circle itself is also included it is referred to as the closed unit disk. +### More Informaction +https://en.wikipedia.org/wiki/Unit_circle