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QR=4 and RP=2
As ΔABC≈ΔPQR and AB corresponds to PQ and BC corresponds to QR,
AB/PQ=BC/QR=CA/RP
Hence 9/3=12/QR=6/RP
i.e. 9/3=12/QR
or QR=3×12/9=36/9=4
and 9/3=6/RP
or RP=3×6/9=18/9=2
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