🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaTiếng ViệtTürkçeРусскийالعربيةفارسی한국어中文日本語EntityQ1332450· pop 32· linked from 150 articleselliptic geometrynon-Euclidean geometryAvailable in 31 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoالعربيةArmenianConnectionsparallelogramEntityspherical trigonometryEntityCategoriesClassical geometryMetric geometryNon-Euclidean geometry