Finding Efficiency from a P-V Graph

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yossup
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uh...just wondering but how do you find out the efficiency from a P-V graph?
 
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depends on the engine's process
 
The figure is a PV diagram for a reversible heat engine in which 1.0 mol of argon, a nearly ideal monatomic gas, is initially at STP (point a). Points b and c are on an isotherm at T = 423 K. Process ab is at constant volume, process ac at constant pressure.

How would I go about finding the efficiency from such a graph?