Finsler-Hadwiger Theorem


	A square rotates around a vertex shared with another square. The quadrilateral with the centers of the squares and the midpoints of the dashed segments as vertices is always a square.


	Contributed by: Sándor Kabai

Finsler-Hadwiger Theorem (Wolfram MathWorld)

"Finsler-Hadwiger Theorem" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/FinslerHadwigerTheorem/

Contributed by: Sándor Kabai

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Polygons

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