STEP OF CONSTRUCTION
(i) Draw a line segment `AB=4.5` cm.
(ii) With A as centre and radius equal to 4 cm, draw an arc.
(iii) With B as centre and radius `=1/2 BC=3` cm, draw another arc, cutting the previous arc at D.
(iv) Join BD and produce it to C such that `BC=6` cm.
(v) Join AC.
Then, `Delta ABC` is the required triangle.