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Perpendicular bisectors of four sides

Let's draw the perpendicular bisectors of the four sides of quadrangle ABCD, and label the intersections of bisectors E, F, G, H.
What does quadrangle EFGH become?


  1. : Exploring correspondence
  2. : In the condition of particular shape
  3. : Always parallelogram
  4. : The result is one point
  5. : The result is one point/Sets of corresponding points

Forum of Geometric Constructor by Y.Iijima