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E and F are points on the sides PQ and P...

E and F are points on the sides PQ and PR respectively of `Delta` PQR. For each of the following cases, state whether EF || QR:
(i) `PE=3.9 cm, EQ=3 cm,PF=3.6 cm,FR=2.4cm`
(ii) `PE=4 cm,QE=4.5 cm,PF=8 cm,RF=9 cm`
(iii) `PQ=1.28cm,PR=2.56 cm,PE=0.18cm,PF=0.36cm`

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