Hi

  is the Midpoint of Q(1,8)and R(x,y)

Midpoint Pt(x,y):  ( , )

Q(1,8)

R(x,y)  (1+x)/2=, x = 6  and  (8+y)/2 = , y = -4

R(6,-4)is the pt at the other end of the diameter QR 

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