Mathematics – General Mathematics
Scientific paper
2010-04-16
Mathematics
General Mathematics
4 pages; withdrawn because of generalised results in article 1007.0152
Scientific paper
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.
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