Talk:Incircle and excircles of a triangle

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The "printable version" of this article needs fixing. Several equations do not print and the margins need adjustment so that figures print properly. —Preceding unsigned comment added by (talk) 15:03, 30 April 2008 (UTC)

I recently added an external link to this page to another related page ( Someone removed the link saying it was commercial which it is not. The reason it is an external page is that it contains a java applet to convey a deeper understanding of the subject. This is not possible in Wikipedia.

Other links on this page are to cuttheknot which is clearly ad-based and therefore commercial, yet these links remain.

Could the person that deleted the link explain why? Should I remove these too?

I don't know who deleted the link, but it was probably done by mistake. Shinobu 19:27, 1 June 2007 (UTC)

contact triangle, context[edit]

Contact triangle redirects here, but the article doesn't really define it. It's sort of implicitly defined in the caption of a figure. The article also seems to me to lack context. There's no explanation of why any of these notions are interesting or useful -- whether they have applications, or links to other areas of mathematics.-- (talk) 02:50, 5 June 2008 (UTC)

Gergonne Point Link[edit]

The link in this article to the Gergonne point redirects back to this article. —Preceding unsigned comment added by (talk) 05:20, 5 June 2008 (UTC)


This should not be merged with the Incircle/Excircle article. A quick scroll through the Internet shows that there are a number of interesting properties relating to the this triangle center X(9) and it is one of the leading 20 triangle centers categorised in ETC. A stub requesting more elaboration should be added to the mittenpunkt article, instead.Frank M Jackson (talk) 14:19, 27 April 2010 (UTC)


this article should be separated into incircle and excircle Gauravjuvekar (talk) 12:25, 24 September 2011 (UTC)

Other polygons/polyhedra[edit]

The center of the largest inscribed ball (i.e. circle in 2D) of a triangle should be its incircle. In other polygons, the largest inscribed circle may not be an incircle because a) it is still unique, but doesn't touch all edges, or b) it isn't even unique (e.g. in a non-quadratic rectangle). This seems to be related to one of the two definitions of Chebyshev center (I changed that article because this definition was missing although it seems to be more common in literature).

If I'm not totally wrong, a Support Vector Machine is the center if a maximum-radius circle in the dual rendering of Version space (c.f. Slides about SVM active learning). Should there be an article about maximum-radius circles/balls inscribing any polygon/polyhedron? Or should this be included here? -- (talk) 14:50, 25 November 2011 (UTC)

Another incircle property[edit]

In a Pythagorean triangle, the radius of the incircle is always an integer. Proof on request. :) Captain Pedant (talk) 18:10, 16 July 2013 (UTC)

This property appears in Pythagorean triple#Elementary properties of primitive Pythagorean triples. It's also true of each excircle. Duoduoduo (talk) 21:26, 16 July 2013 (UTC)
Fair enough, no need to duplicate then. :) Captain Pedant (talk) 20:19, 17 July 2013 (UTC)