An ideal gas undergoes a cyclic transformation starting from the point A and coming back to the same point by tracing the path A → B → C → A. On the diagram the volume (in ) is plotted on the vertical axis and the pressure (in ) on the horizontal axis, and the three vertices are
with A → B at constant pressure, B → C a straight line, and C → A at constant volume. The total work done in the process is _____ J.
