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Perimeter of triangle which inscribes in a circle

A, B, and C are on a circle O.
When will the perimeter of ΔABC be maximized/minimized?

GC/Win


  1. : Confirming with measurement
  2. : Decoding the meaning of additional line
  3. : Decoding the meaning of additional line
  4. : Measurement and conjecture
Forum of Geometric Constructor by Y.Iijima