construct a parallelogram  AC=6.5cm BC=4.2cm AB=3.6cm

We have to follow

Step 1 - Draw AC = 6.5 cm

Step 2 - Taking C as centre draw an arc of 4.2 cm below AC and 3.6 cm above AC.

Step 3 - From A taking as centre, draw an arc of 4.2 cm above and 3.6 cm below to intersect the initial arcs drawn from C in order to get D and D.

Step-4 - ABCD is the the required parallelogram.