FERMAT 2015 Problem 5

Past Contests FERMAT FERMAT - 2015
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The points P(3,-2),Q(3,1),R(7,1), and S form a rectangle. What are the coordinates of S?

Answer Choices
A. (-1,-2)
B. (7,-2)
C. (7,4)
D. (3,7)
E. (1,-2)