Finsler-Hadwiger Theorem
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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 (September 2007)
Open content licensed under CC BY-NC-SA
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detailSectionParagraphPermanent Citation
"Finsler-Hadwiger Theorem"
http://demonstrations.wolfram.com/FinslerHadwigerTheorem/
Wolfram Demonstrations Project
Published: September 28 2007