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Consider ΔACD.
DS : SA = DR : RC = 2 : 1
We know that if a line cuts two sides of a triangle in the same ratio, then it will be parallel to the third side.
∴ RS ║ AC → (1)
Consider ΔABC.
AP : PB = CQ : QB = 1 : 2
PQ ║ AC → (2)
From (1) and (2),
PQ ║ RS
Draw diagonal BD.
Consider ΔBCD.
CQ : QB = CR : RD = 1 : 2
∴ QR ║ BD → (3)
Consider ΔABD.
AS : SD = AP : PB = 1 : 2
∴ PS ║ BD → (4)
From (3) and (4),
PS ║ QR
Consider quadrilateral PQRS.
We got that PQ ║ RS and PS ║ QR.
∴ PQRS is a parallelogram.
Hence proved.
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