The diameter of a polygon is the largest distance between any pair of vertices. In other words, it is the length of the longest polygon diagonal (e.g., straight line segment joining two vertices).
Polygon Diameter
See also
Diameter, Generalized Diameter, Graham's Biggest Little Hexagon, Biggest Little Polygon, Graph Diameter, Polygon Diagonal, Polygon VertexExplore with Wolfram|Alpha
References
Audet, C.; Hansen, P.; Messine, F.; and Perron, S. "The Minimum Diameter Octagon with Unit-Length Sides: Vincze's Wife's Octagon is Suboptimal." J. Combin. Th. Ser. A 108, 63-75, 2004.Referenced on Wolfram|Alpha
Polygon DiameterCite this as:
Weisstein, Eric W. "Polygon Diameter." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/PolygonDiameter.html