Exact colinearity of centroids of iterated midpoint hexagons
Metric Geometry
2026-04-07 v1
Abstract
We study the iteration that replaces a planar hexagon by the hexagon formed by joining the midpoints of consecutive edges. While this iteration quickly drives any polygon toward a point and their shapes asymptotically regularize, we show a stronger and unexpected rigidity holds for hexagons: from the second iterate onward, the centroids of the filled hexagons all lie exactly on a fixed line. This exact colinearity reflects a special algebraic feature of the hexagonal case and does not hold generally for any other polygons.
Cite
@article{arxiv.2604.04668,
title = {Exact colinearity of centroids of iterated midpoint hexagons},
author = {Jack Edward Tisdell},
journal= {arXiv preprint arXiv:2604.04668},
year = {2026}
}
Comments
6 pages, 1 figure