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Consider the points \(A(1, 4)\) and \(B(5, -2)\).
  1. Calculate the length of the segment \([AB]\).
  2. Determine the coordinates of the midpoint of the segment \([AB]\).
  3. Determine the set of points \(M\) in the plane satisfying \(\Vect{MA} \cdot \Vect{MB}=0\).

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