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Geometry Difficulty 2.0 Junior Find the answer United Kingdom

Three vertices of the rectangle $PQRS$ are at $P(1, 1)$ , $Q(7, 4)$ and $R(5, 8)$ . What are the co-ordinates of $S$ ?

(A) $(-1, 4)$ (B) $(0, 5)$ (C) $(-2, 6)$ (D) $(-1, 5)$ (E) $(-1, 6)$

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