An euclidean affine invariant of quadrilaterals
General Mathematics
2022-02-14 v3
Abstract
A certain real number, depending on two neighbouring sides of a quadrilateral and the diagonal meeting these two sides at their common point, is shown to be invariant under affinity. As an application we demonstrate a nice formula for the area of a finite sector at centre of a planar quadric with point symmetry.
Cite
@article{arxiv.1004.2829,
title = {An euclidean affine invariant of quadrilaterals},
author = {Helmut Kahl},
journal= {arXiv preprint arXiv:1004.2829},
year = {2022}
}
Comments
deprecated by arXiv:1007.0152