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ABCD is a quadrilateral in which P,Q, R ...

ABCD is a quadrilateral in which P,Q, R and S are midpoints of the sides AB , BC, CD and DA .AC is a diagonal. Śhow that
i) SR is parallel to AC, and SR=`1/2` AC.
ii) P Q=SR
iii) PQRS is a parallelogram.

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