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Connecting the midpoints of four sides

The midpoint of each side of quadrangle ABCD, AB, BC, CD, and DA is labeled as P, Q, R, and S. So, what quadrangle PQRS become ?

GC/Win


  1. : Exploring correspondence
  2. : In the condition of particular shape
  3. : In the condition of particular shape
  4. : In the condition of particular shape
Forum of Geometric Constructor by Y.Iijima