Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where horizontal axis is V and each unit is 0.5*10^-3 m^3, V1 = 1.0*10^-3 m^3 and V2 = 4.0*10^-3 m^3. The vertical axis is P(N/m^2);

Question

Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where horizontal axis is V and each unit is 0.5*10^-3 m^3, V1 = 1.0*10^-3 m^3 and V2 = 4.0*10^-3 m^3. The vertical axis is P(N/m^2); 
A is (1.0*10^-3,2.6*10^6), 
B is (4.0*10^-3,2.0*10^6), 
C is (4.0*10^-3,0.6*10^6), 
D is (1.0*10^-3,1.0*10^6).

I can't copy the figure. I hope someone can understand and help me to solve the problem.