Problem F2-5 Statics Hibbeler 12th (Chapter 2)

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The force F = 450 lb acts on the frame. Resolve this force into components acting along members AB and AC, and determine the magnitude of each component.
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I have been watching videos but your clarifies the reason. Thanks

HowTomin-coni
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I dont get how you know where should AB and AC member arrows direction, why it not fir example AB member is direct along compression direction? I hope you got my point

felonius