\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Let \(A(1,1)\), \(B(3,6)\), \(C(5,0)\) and \(D(0,2)\).
Prove that the lines \(\Line{AB}\) and \(\Line{CD}\) are perpendicular.
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