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Using W = P * deltaV, I thought that I would find the work done for each leg of the triangle and sum the results for the total Work. For the green leg, I wasn't sure how this would be calculated as Pressure and Volume are both changing.
The solution, however, is to interpret the Work done by the gas in the cycle as the area of the triangle. I'm trying to better understand why this interpretation is used. Is my initial approach invalid?
Thanks!