Geodesic
Some Inequalities Between two Polygons Inscribed one in the Other
Bulletin of the Malaysian Mathematical Society, Tome 28 (2005) no. 1 Cet article a éte moissonné depuis la source Bulletin of the Malaysian Mathematical Society website

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It is well known that, given a triangle inscribed in another triangle, the perimeters of the three external triangles can never all be simultaneously greater than the perimeter of the inscribed triangle and that furthermore they are all equal to it if and only if we put the vertices of the inscribed triangle at the midpoints of sides of the circumscribed triangle. The same result is true for the areas. The present paper shows how such a results extends to the case of two convex polygons inscribed one in other, connecting it to the classic works about inscribed and circumscribed polygons respectively with minimum and maximum perimeter. 
@article{BMMS_2005_28_1_a8,
     author = {Aurelio de Gennaro},
     title = {Some {Inequalities} {Between} two {Polygons} {Inscribed} one in
  the {Other}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2005},
     volume = {28},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2005_28_1_a8/}
}
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Aurelio de Gennaro. Some Inequalities Between two Polygons Inscribed one in
  the Other. Bulletin of the Malaysian Mathematical Society, Tome 28 (2005) no. 1. http://geodesic.mathdoc.fr/item/BMMS_2005_28_1_a8/