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## Main Question or Discussion Point

A force, f1, of a magnitude 6 N acts on particle P. A second force, f2, of magnitude 8 N acts at 60 degrees to f1. Determine the resultant and equilibrant of f1 and f2.

I use cosine law and found the resultant is 7.2 but the answer is 12.7

I used angle 60 and my solution manual says I had to use 120, but I don't understand why that it

I use cosine law and found the resultant is 7.2 but the answer is 12.7

I used angle 60 and my solution manual says I had to use 120, but I don't understand why that it