In the adjoining figure ABCD is a quadrilateral and AC is one of the diagonals. Prove that (i) AB+BC

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In the adjoining figure ABCD is a quadrilateral and AC is one of the diagonals. Prove that (i) AB+BC+CD+DA greater than 2AC
(ii) AB+BC+CD greater than DA
(iii) AB + BC + CD + DZ greater than AC + BD

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