\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Consider the points \(A(-1, -3)\) and \(B(3, 0)\).
  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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