Good articleIsosceles triangle has been listed as one of the Mathematics good articles under the good article criteria. If you can improve it further, please do so. If it no longer meets these criteria, you can reassess it.
Did You Know Article milestones
DateProcessResult
September 13, 2018Good article nomineeListed
Did You Know A fact from this article appeared on Wikipedia's Main Page in the "Did you know?" column on November 1, 2018.
The text of the entry was: Did you know ... that decorative patterns using isosceles triangles date back to the Early Neolithic?

Etymology

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Can we add the etymology of the word 'isosceles' here? Googling I found that it was "isos ‘equal’ + skelos ‘leg’". I think it aids understanding. Chockyegg (talk) 15:40, 9 October 2014 (UTC)Reply

Usages

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Page Punta Cruz Watchtower refers to a "perfect isosceles triangle". Does that mean anything? 112.198.82.241 (talk) 03:17, 20 October 2014 (UTC)Reply

I think it's just intended to mean "as opposed to a triangle with two sides nearly equal". Loraof (talk) 16:21, 9 September 2015 (UTC)Reply

ipa?

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. — Preceding unsigned comment added by 62.235.179.44 (talk) 08:34, 27 March 2016 (UTC)Reply

GA Review

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This review is transcluded from Talk:Isosceles triangle/GA1. The edit link for this section can be used to add comments to the review.

Reviewer: Fearstreetsaga (talk · contribs) 19:34, 11 September 2018 (UTC)Reply

The article was a good read. Here are my suggestions:

Terminology, classification, and examples
  • "isosceles sets, sets of more than three points in which every triangle is isosceles" Based on the definition provided in the reference, an isosceles set could have three points. This also does not make it clear where these triangles come from; consider rewording this to make it more clear that any three points in the set form an isosceles triangle.
Perimeter
  • "In the equilateral case (when the isoperimeteric inequality becomes an equality) there is only one such triangle, which is equilateral." Mentioning equilateral twice here is repetitive. We know the triangle is equilateral because we are considering the equilateral case.
Angle bisector length
Radii
In architecture and design
History and fallacies
  • "Others claim that the name stems" Replace claim per MOS:Words to watch
  • "but W. W. Rouse Ball claims priority in this matter" What do you mean by this?
Notes
  • "Some other sources claim" Same as above
    •   Done. This was the toughest one to handle, because I don't want to list publications in the references section (implicitly saying that they're good references to the subject) only to say somewhere else that they're actually not so good, and I don't think we need to point fingers at authors of discredited theories. But I found a recent and impeccable source (Clagett) who attributes the "some other sources" claim more specifically to "many of the early Egyptologists" so I went with that as a direct quote. —David Eppstein (talk) 06:53, 13 September 2018 (UTC)Reply
References


@Fearstreetsaga: Ok, I think I've handled all the points you mentioned above. Anything else to do? —David Eppstein (talk) 06:53, 13 September 2018 (UTC)Reply

@David Eppstein: Everything looks good. I'll go ahead and pass the article. Congratulations. Fearstreetsaga (talk) 13:24, 13 September 2018 (UTC)Reply


Bold in lead

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Why is there so much bold in the lead section? Didnt3a (talk) 10:05, 10 October 2021 (UTC)Reply

There isn't anymore. ~Anachronist (talk) 21
07, 8 December 2022 (UTC)

Internal similarity

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I wanted to point out a feature of isosceles triangles but am not sure where it would fit.

If you draw a line perpendicular from any side of an isosceles triangle to the opposite corner, the triangle is subdivided into two similar right triangles. These two triangles are congruent if the perpendicular line is drawn from the iscosceles base. ~Anachronist (talk) 21:12, 8 December 2022 (UTC)Reply

Lewis Carroll died at the beginning of the year 1898.

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How could he publish something in 1899? This is a clear mistake, at least unclear information, since there is no reference. If this refers to "Curiosa Mathematica", then it has to be 1890. So I guess it is a typo. 46.114.146.99 (talk) 08:40, 28 February 2023 (UTC)Reply

The Lewis Carroll Picture Book was published posthumously. The specific section here was originally intended to be part of Curiosa Mathematica part 3, which was never completed. –jacobolus (t) 04:41, 5 January 2024 (UTC)Reply