Need Help with a Triangular Loop Problem?

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sfgoat
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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
 

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