We have to find the coordinates of the remaining vertice and the other two vertices are (0,0) and (6,0) .
since x-co rdinates avg is 3 so (x + 0+ 6)/3=3 so x=3
since y-cordinates avg is 2 so (y + 0 + 0)/3=2 so y=6.
Hope this helps.
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