The quadrilateral formed by joining the midpoints of the sides of a quadrilateral \( A B C D \),... VIDEO
The quadrilateral formed by joining the midpoints of the sides of a quadrilateral \( A B C D \), taken in order, is a rectangle, if
(a) \( A B C D \) is a parallelogram
(b) \( A B C D \) is a rectangle
(c) diagonals of \( A B C D \) are equal
(d) diagonals of \( A B C D \) are perpendicular to each other
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