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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
217:(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. —
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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.--
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Well it seems that name is somewhat established (even though it beeing a lesser or little known theorem in general):
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on
Knowledge. If you would like to participate, please visit the project page, where you can join
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British geometer has never heard of this. Shouldn't it be the
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https://artofproblemsolving.com/index.php/British_Flag_Theorem
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