Solution :
(i) In figure (i)
Since DE || BC, therefore
\(AD\over DB\) = \(AE\over EC\)
\(\implies\) \(1.5\over 3\) = \(1\over EC\)
\(\implies\) EC = 2 cm.
(ii) In figure (ii),
Since DE || BC, therefore
\(AD\over DB\) = \(AE\over EC\)
\(\implies\) \(AD\over 7.2\) = \(1.8\over 5.4\)
\(\implies\) AD = 2.4 cm.
