The quadrilateral formed by joining the mid-points of the sides of a quadrilateral PQRS, taken in order, is a rectangle if:
A. PQRS is a parallelogram.
B. PQRS is a rectangle.
C. the diagonals of PQRS are perpendicular to each other.
D. the diagonals of PQRS are equal.
Answer:C
The quadrilateral formed by joining the mid-points of the sides of a quadrilateral PQRS, taken in order, is a rectangle if:
A. PQRS is a parallelogram. B. PQRS is a rectangle. C. the diagonals of PQRS are perpendicular to each other. D. the diagonals of PQRS are equal.