The polygon formed by the lines tangent to the circumcircle of a polygon. The tangential polygon of an 
-gon is itself an 
-gon.
Tangential Polygon
See also
Dual Polyhedron, Nested Polygon, Tangential Quadrilateral, Tangential TriangleExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Tangential Polygon." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/TangentialPolygon.html