Talk:Unit circle

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One of the 500 most frequently viewed mathematics articles.

This was a duplicate page, at "Unit Circle":


The Unit Circle is a circle of radius 1 unit, oftenly used to define the functions of trigonometry.

In this diagram, individual points on the unit circle are labeled first with its coordinates (exact values), with the angle in degree angular measure, then with radian angular measure. Points in the lower hemisphere have both positive and negative angles marked.

Radian Unit Circle



Geometers notation S2: really? I don't think I have ever seen this - which is not to say it isn't used, but is it common enough to warrant inclusion?

Charles Matthews 12:30, 17 Aug 2004 (UTC)


In the representation of the triginometric functions in the unit circle, it would be useful to add that the values of the tangent of an angle theta are also represented by the vertical tangent to the unit circle and the values of the co-tangent by the horizontal tangent.

why doesn't anyone like math?[edit]

i really like what we're doing in calculus, but everybody hates math...why is that?

There are many people who like math. However, this isn't the right place for this question - try Wikipedia:Reference desk/Mathematics instead (in fact, I think it was asked there some time ago, maybe you should try looking in the archives for some useful responses). -- Meni Rosenfeld (talk) 20:33, 1 December 2006 (UTC)


i don't like math because the concepts are confusing. i don't enjoy math because if you don't understand one small detail, then your entire answer is off, or you don't know where to begin in solving the problem itself. math leads to frustration in my experience. it has always been my worst subject. this year i am taking a trig class (because it's a requirement and because it looks good on your resume). we are learning about the unit circle. the π/6, π/3, etc etc confuses me so much. when i ask for help of course whoever is helping me asks what part do you not understand. THE WHOLE DARN THING! just do the problem for me so i can figure out the next one! so with that said, if anyone would be so kind as to explain the unit circle to me in words i would understand (just pretend you're explaining it to a 10 year old, which i'm not, but chances are i wil understand what you are saying, mathematically). thank you so much. i hope this ramble also answered the above question, "why doesn't anyone like math?" i wish i did. life would be a lot easier. i'm just more of a languages personWiki234234 (talk) 22:19, 20 September 2009 (UTC)RNR

Image at bottom of page[edit]

What is the image at the bottom of the page for? I don't think a discussion of a circle of radius 1 versus a circle of diameter 1 has any place on this page.

  • yes it does. it completely relates to the unit circle. Wiki234234 (talk) 22:17, 20 September 2009 (UTC)RNR

Matulga 21:11, 10 December 2006 (UTC)

Circle-trig6.svg[edit]

The image Circle-trig6.svg doesn't even come close to printing out correctly for me.


Euclidean plane[edit]

'Euclidean plane' is (deliberately?) unclickable. Are we, here, at the boundary between elicitation of responses to multiple-choice questions and professing of purported facts? Knotwork (talk) 20:24, 23 April 2008 (UTC)

Please include reference to Euler's formula[edit]

http://en.wikipedia.org/wiki/Euler's_formula

This article needs to be a reference. It is deeply related to how and why the unit circle works. The first section "Forms of unit circle points" even gives the formula without linking to it or explaining what it is. — Preceding unsigned comment added by 24.215.213.106 (talk) 14:55, 13 November 2012 (UTC)