Use vectors to find the fourth vertex of a parallelogram


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How to find the fourth point of a parallelogram in 3d?

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Find the coordinate of the fourth vertex. Three vertices of a parallelogram ABCD are A(3,-1,2), B(1,2,-4), and C(-1,1,2). Find the coordinate of the fourth vertex. To get the answer I tried the distance formula, equated AB=CD and AC=BD.








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