🌐EnglishEnglishDeutschEspañolFrançaisItalianoPortuguêsTiếng ViệtРусскийالعربيةفارسیहिन्दी한국어中文日本語EntityQ12243537· pop 23· linked from 129 articlesconcave polygonAlso known as non-convex polygon, reentrant polygonsimple polygon which is not convexWikidata factsImageConcave Polygon Triangulation.svgvia Wikidata · CC0Available in 22 languagesEspañolFrançais中文日本語Portuguêsالعربيةहिन्दीArmenianBosnianCentral KurdishConnectionsquadrilateralEntityparallelogramEntityCategoriesTypes of polygons