Back مضلع مماسي Arabic Tangentenvieleck German Polígono tangencial Spanish Poligono ukitzaile Basque Tangentiaalinen monikulmio Finnish Polygone circonscriptible French Érintősokszög Hungarian 円外接多角形 Japanese Poligon circumscriptibil Romanian Описанный многоугольник Russian
In Euclidean geometry, a tangential polygon, also known as a circumscribed polygon, is a convex polygon that contains an inscribed circle (also called an incircle). This is a circle that is tangent to each of the polygon's sides. The dual polygon of a tangential polygon is a cyclic polygon, which has a circumscribed circle passing through each of its vertices.
All triangles are tangential, as are all regular polygons with any number of sides. A well-studied group of tangential polygons are the tangential quadrilaterals, which include the rhombi and kites.