🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsРусскийالعربيةفارسی한국어中文日本語EntityQ619449· pop 26· linked from 294 articlesProblem of Apolloniusconstruct circles that are tangent to three given circles in a planeAvailable in 25 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoالعربيةAlbanianConnectionscompass and straightedge constructionEntitypole and polarEntityCategoriesAncient Greek mathematicsCommons link from WikidataConformal geometryEuclidean plane geometryHistory of geometryIncidence geometryWikisource templates with missing id