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Making a square(3)


Various quadrangle EFGH are made by quadrangle ABCD.
I want to make EFGH a square.
How would you make EFGH a square by movable points?





  1. : (1)-1
  2. : (1)-2
  3. : (2)-1
  4. : (2)-2
  5. : (3)-1
  6. : (3)-2
  7. : (4)-1
  8. : (4)-2

Forum of Geometric Constructor by Y.Iijima