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2015-03-19T16:31:15+05:30
Let (1,6) be one end of the diagonal [A]
Let (12,9) other end of the diagonal [B]

Mid-point of the diagonal AB =[(12+1)/2] , [(9+6)/2)]
  =(13/2,15,2)

3(15/2) = 11(13/2) + k

45/2 = 143/2 + k

k = 45/2 - 143/2 

k = -98/2 = -49
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