(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Vectors A and B have equal magnitudes of 57. If the sum of A and B is the vector 16.3j , determine the angle?

3. The attempt at a solution

I have already gotten the answer

2•57cosθ = 16.3

cosθ = 0.143

θ = 81.8º

twice that is the angle between them, or 163.6º

but at first i did 2*57sinθ=16.3 since we have the y component and as far as I know y=rsinθ

why is the right answer cos?

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# Homework Help: I need someone to explain this vector question's answer

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