1.

Which of the following conditions is necessary for a quadrilateral formed by joining the midpoints of the sides of a quadrilateral PQRS, taken in order, to be a rectangle?

A. PQRS is a rectangle.
B. PQRS is a parallelogram.
C. Diagonals of PQRS are perpendicular.
D. Diagonals of PQRS are equal.
Answer» D. Diagonals of PQRS are equal.


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