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So initially I find the reactions at the pins using a free body diagram, I get that. However, when I need to find the forces of the particular members am I supposed to take an initial guess as to whether or not the forces are compressive or tensile and then based on whether or not I get a negative for my result proves the accuracy of initial assumption?

Or do I analyze the loads being placed on the structure and should it tell me from observation what direction the forces are going?

Any help is greatly appreciated.