Answer :
(i) we have PM=4cm, QM=4.5 cm,PN=4 cm and NR=4.5 cm
Hence PM/QM=4/4.5=40/45=8/9
PN/NR=4/4.5=40/45=8/9
PM/QM= PN/NR
by the converse of proportionality theorem
MN∥QR
(ii) we have PQ=1.28cm, PR=2.56 cm,PM=0.16 cm and PN=0.32 cm
Hence PQ/PR=1.28/2.56=128/256=1/2
PM/PN=0.16/0.32=16/32=1/2
PQ/PR = PM/PN
by the converse of proportionality theorem
MN∥QR
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