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PQRS is a parallelogram. PS is produced ...

PQRS is a parallelogram. PS is produced to M, so that SM = SR and MR produced meets PQ produced at N. Prove that QN = QR.

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With the given details, we can create a diagram. Please refer to video for the diagram.
From the figure, `SM||QR||PS`
`:. /_QRN =/_SMR`
Also, `PQ||SR||QN`
`:./_RSM = /_RQN`
In `Delta RSM and Delta NQR`,
`/_QRN =/_SMR`
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