Need Help with a Triangular Loop Problem?

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The discussion revolves around a triangular loop problem where the user seeks clarification on a test question they answered incorrectly. The key point raised is whether the equation sin(φ) = 1 applies to all segments of the loop. It is confirmed that while this holds for the ac segment, it does not for the other two segments, specifically bc, where sin(π) or sin(2π) equals zero. This leads to the conclusion that the force on the bc segment would indeed be zero. The conversation encourages further exploration of the problem for better understanding.
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This is a question I got wrong on a test and would like to see if I can get someone to show me how to do it properly. Snapped a pic . See below please. Thanks.
 

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You've written ##\sin(\phi )=1## at the top. And that is true for the ac segment. But is it true for the other two segments?
 
So would the force on the bc segment be zero since the sin(pi or 2pi) would be zero
 
yep, you got it. keep going :)
 

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