Talk:British flag theorem

One British geometer has never heard of this. Shouldn't it be the Norwegian flag theorem? Geometry guy 19:59, 13 May 2007 (UTC)

Well it seems that name is somewhat established (even though it beeing a lesser or little known theorem in general):

• http://geometry-math-journal.ro/pdf/Volume4-Issue1/5.pdf
• https://jrmf.org/problems/PythagorasRevisited.pdf
• https://arxiv.org/pdf/1806.02484.pdf
• http://www.student.uwa.edu.au/__data/assets/pdf_file/0005/1861142/Applications-of-Mathematics.pdf
• https://artofproblemsolving.com/wiki/index.php/British_Flag_Theorem

--Kmhkmh (talk) 04:03, 22 December 2018 (UTC)

Also MR3343180 (the only instance of any kind of flag theorem in MathSciNet). It doesn't seem to be a commonly used name in research mathematics, but then this sort of elementary geometry is not a popular topic in research mathematics. —David Eppstein (talk) 04:39, 22 December 2018 (UTC)

I think that one is the first pdf i've linked above. I think the name is probably somewhat common/popular in (highschool) math education by now, that is you see it popping up in problem corners, on youtube and in various teaching materials you can find on the internet. Overall i think the name is fine, but it should be noted that the current sources of the article don't seem to use them name, but just state it as a nameless property or theorem.--Kmhkmh (talk) 05:34, 22 December 2018 (UTC)