\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Let A, B, C, and D be four points in the complex plane with respective affixes \(z_A = 1\), \(z_B = 3+i\), \(z_C = 2+3i\), and \(z_D = 2i\).
Prove that the quadrilateral ABCD is a square.
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