The members of the truss are assumed to be pin connected. If member \(G F\) is an \(\mathrm{A}-36\) steel rod having a diameter of 2 in., determine the greatest magnitude of load \(\mathbf{P}\) that can be supported by the truss without causing this member to buckle.

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12 ft A H 16 ft P B 16 ft P C 16 ft- E D