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Joseph O'Rourke
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A supplement to Ian's answer: Here is the largest-area sofa known, due to Gerver:


![GerverSofa][1]

Gerver, Joseph L. (1992). "On Moving a Sofa Around a Corner". Geometriae Dedicata 42 (3): 267–283. (Springer link.)

Joseph O'Rourke
  • 150.9k
  • 36
  • 358
  • 958