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The points Q(1, -1), R(-1, 0) and S(0, 1) are three vertices of a parallelogram.  What are the possible positions of the fourth vertex?

 Jun 17, 2020
 #1
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We graph the points we are given. It looks like (2, 0) is the only possible fourth vertex.

 Jun 17, 2020
 #2
avatar+23245 
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I believe that there is another possibility:  (0, -2).

 Jun 17, 2020

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