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14U. Let ABCD be a parallelogram. (a) Prove that ABCD is cyclic if and only if it is a rectangle, in which case its cir- cumcenter is the point where its diagonals intersect. (b) Prove that ABCD is tangential if and only if it is a rhombus, in which case its incenter is the point where its diagonals intersect
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14U. Let ABCD be a parallelogram. (a) Prove that ABCD is cyclic if and only if...
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