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UKMT Pink Kangaroo, 2016

Geometry Difficulty 2.0 Junior Find the answer United Kingdom

Four of the following points are vertices of the same square. Which point is not a vertex of this square?

(A) $(-1, 3)$ (B) $(0, -4)$ (C) $(-2, -1)$ (D) $(1, 1)$ (E) $(3, -2)$

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