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Answer to Question #5168 in Analytic Geometry for aljon

Question #5168
three consecutive vertices of a parallelogram (1,-3),(-3,-1), (3,5). FIND THE 4TH VERTEX?
Expert's answer
If ABCD is a parallelogram and D(x,y) then the midpoint of AC(the diagonal of ABCD) is ((1+3)/2,(-3+5)/2)=(2,1);
The midpoint of BD (the diagonal of ABCD) is ((x-3)/2, (y-1)/2)
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