I tried this question a lot of time and few day's earlier I also solved it correctly but I don't know why I am not able to solve it now. I can't get what link I am missing. ques: 2 moles of helium gas undergo a cyclic process as shown. Assuming the gas to be ideal calculate the net change in heat energy, the net work done, the net change in internal energy

If any one would just be able to give me the basics to approach the ques this will also help me?