Home›Japanese mathematics›napkin ring problem🌐EnglishEnglishDeutschEspañolFrançaisItalianoPortuguês中文日本語EntityQ6964957· pop 9· linked from 8 articlesnapkin ring problemproblem in geometryWikidata factsShow 1 more factCommons categoryNapkin ring problemvia Wikidata · CC0Available in 8 languagesEspañolFrançais日本語PortuguêsItalianoGreekHebrewvia Wikidata sitelinks · CC0ConnectionsJapaneseEntitygeometryEntityCategoriesJapanese mathematicsMathematical problemsRecreational mathematicsVolume