Question 1107794
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The diagonals of a parallelogram bisect each other.  So the distance and direction from a vertex to the point of intersection of the diagonals is the same as the distance and direction from the point of intersection to the opposite vertex.<br>
So, for example, one given vertex is (-7,2) and the point of intersection of the diagonals is (-2,1.5).  To get from the vertex to the point of intersection, you need to move 5 units right and 0.5 units down.  So to find the opposite vertex, you need to start at (-2,1.5) and go another 5 units to the right and 0.5 units down.<br>
And similarly starting from the other given vertex you can find the last vertex.