# Talk:Biangular coordinates

WikiProject Mathematics (Rated Stub-class, Low-importance)
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Mathematics rating:
 Stub Class
 Low Importance
Field:  Geometry

## diagram

I find this article confusing, because the text says biangular coordinates are a coordinate system for the plane where A and B are two fixed points, and the position of a point P not on the line AB is determined by the angles PAB and PBA., but the diagram has no point B, instead calling it -a. Should the article be rephrased to reflect this? Dlabtot (talk) 20:35, 29 November 2008 (UTC)

Sorry! I added the image to the article, but forgot to modify the content. Now, it should look OK. Thanks for pointing out the mistake. Thurth (talk) 06:17, 30 November 2008 (UTC)
Well, now the text still refers to 'the line AB', but the diagram has no 'point A', nor a 'point B'. I would modify the text myself except I don't feel qualified as I'd never even heard of the term till I came here by way of the random article link. Dlabtot (talk) 15:44, 30 November 2008 (UTC)
Your right. It's corrected. Thanks! Thurth (talk) 04:03, 1 December 2008 (UTC)
Much better. But I do have some more comments, if you're up for them...not sure why you went with C1 and C2 instead of a and b... why is there an x and y-axis? just to connect this to a Cartesian plane? it seems unnecessary. I'm also not sure what is the significance of -a and a. And a question: Is there a way to refer to the position of a point (other than C1 or C2) on the line C1C2 using biangular coordinates?Dlabtot (talk) 04:26, 1 December 2008 (UTC)
My main contribution is to translate articles from Enlish to Chinese. While I was translating this stub article, I found that there was no accompanying diagram for the article. With a diagram, it would be easier too understand the material. Now, I am not a geometry expert. I am not sure what's the most economic way to express this material in a way best facilitate people to read and understand the material. So, it would better to leave the major editing job to others. I think there are many people who can do a much better job than I can. In other words, I only do minor editing in English articles. Thurth (talk) 05:22, 2 December 2008 (UTC)
Well, good job. The diagram definitely does help the article. Dlabtot (talk) 14:28, 2 December 2008 (UTC)