Answer the 11th whole question."DON'T SEND STHE SIMILAR QUERIES.KINDLY PERFORM THE STEP BY STEP AND APPROPRIATE ANSWER".

11.  (i) Prove that bisectors of any two adjacent angles of a parallelogram are parallel. 
(ii) Prove that bisectors of any two opposite angles of a parallelogram are parallel. 
(iii) If the diagonals of a quadrilateral are equal and bisect each other at right angles, then prove that it is a square.

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