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ABCD is a rectangle formed by the point...

ABCD is a rectangle formed by the points A(-1, -1) , B(-1, 4), C(5,4) and D(5, -1) . P,Q R S are the midpoints of AB, BC, CD, and DA respectively. Is the quadrilateral PQRS a square ? a rectangle ? or a rhombus ? Justify your answer.

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The correct Answer is:
PQRS is a rhombus.
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