Can any rectangle be inscribed in any convex figure?
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$\begingroup$ theory.stanford.edu/~tomas/rect.html seems to answer the square case. $\endgroup$– Dan BrumleveAug 16, 2010 at 6:50
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$\begingroup$ Do you mean a rectangle of any proportion, rather than any rectangle? $\endgroup$– John BentinAug 17, 2010 at 7:58
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1 Answer
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Yes, this follows from a more general result in
Nielsen and Wright, Rectangles inscribed in symmetric continua. Geom. Dedicata 56 (1995), no. 3, 285–297 MR
(This is reference 4 in the Wikipedia article I quoted in my answer to your previous question.)
In their terminology, a simple closed curve $C$ is symmetric if there exists a point $P\notin C$ such that each straight line through $P$ intersects $C$ in exactly 2 points. This condition is trivially satisfied when $C$ is a boundary of a convex region.