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**Area under the curve in PV diagram(q35)**

For this question:

http://tinyurl.com/37tqvp

What I do is to find the area of PV under the straight line, using

(area of bigger rectangle-area of smaller rectangle)/2

=((p2*v2)-(p1*v1))/2

but this is not one of the choices.

May I know how to solve this question correctly?

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