The dot in figure represents the initial and fina

Dear Pranjal

 

Please check and repost the question with an attachment. As no image is attached.

 

Regards

Arun

The product of pressure and volume is represented by an area on a p-V diagram. The area under the curve on a p-V diagram tells us the work done during the process. This can be found by adding up the areas of lots of thin rectangles, each of which corresponds to a constant (or very nearly constant) pressure.
Please attach the figure for further assistance 
Good Luck