M and N are points on the sides AC and BC respectively of a `Delta ABC`. In ech of the fopllowing cases, state whether `MN||AB`.
(i) `CM=4.2 cm. MA=2.8cm, NB=3.6 cm, 5.7`
(ii) `CB=6.92cm, CN=1.04 cm, Ca=1.73 cm, CM= 0.26cm`
(iii) `CM=5.1 cm, CA=6.8 cm, CB=5.6 cm, NB=1.4 cm`.