Area Problems Involving Kasner Polygons.

link: http://arxiv.org/abs/0910.0452
Abstract

Sequences of polygons generated by performing iterative processes on an
initial polygon have been studied extensively. One of the most popular
sequences is the one sometimes referred to as {\it Kasner polygons}. Given a
polygon $K$, the first Kasner descendant $K'$ of $K$ is obtained by placing the
vertices of $K'$ at the midpoints of the edges of $K$.

More generally, for any fixed $m$ in $(0,1)$ one may define a sequence of
polygons $\{K^{t}\}_{t\ge 0}$ where each polygon $K^{t}$ is obtained by
dividing every edge of $K^{t-1}$ into the ratio $m:(1-m)$ in the
counterclockwise (or clockwise) direction and taking these division points to
be the vertices of $K^{t}$.

We are interested in the following problem

{\it Let $m$ be a fixed number in $(0,1)$ and let $n\ge 3$ be a fixed
integer. Further, let $K$ be a convex $n$-gon and denote by $K'$, the first
$m$-Kasner descendant of $K$, that is, the vertices of $K'$ divide the edges of
$K$ into the ratio $m:(1-m)$. What can be said about the ratio between the area
of $K'$ and the area of $K$, when $K$ varies in the class of convex $n$-gons?}

We provide a complete answer to this question.