Answer :

Let the coordinates of the fourth vertex D be (x4,y4).


We know that –


Diagonals of a gm bisect each other.


Mid – point of diagonal AC ≡ Mid – point of diagonal BD



6 = 3 + x4 and 8 = 6 + y4


x4 = 3 and y4 = 2


Thus, the coordinates of the fourth vertex D is (3,2).


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