\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Let \(A(3,1)\), \(B(0,-2)\), \(C(-1,1)\) and \(D(3,-3)\).
Prove that the lines \(\Line{AB}\) and \(\Line{CD}\) are perpendicular.
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