Compute Resultant Force Magnitude & Angle: Vector Addition

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To compute the resultant force magnitude and angle using vector addition, the law of cosines is applied to the given forces: F1=200g at 30 degrees, F2=200g at 120 degrees, and F3=200g at 150 degrees. The expected resultant force is approximately 430g at an angle of 103 degrees. A participant reported a calculation yielding 386.40g at -14 degrees, which was deemed incorrect. Emphasis was placed on the importance of drawing a diagram and setting up equations to clearly show the problem-solving process.
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using the law of cosine , compuete the magnitude of the resultant force. Compute the angle of orienttion from the relationship tan thetha
2 F1=200g at 30 degrees, F2=200g at 120 degrees, F3=200g at 150 degrees. (the value should be close to 430 g of force at 103 degrees.
this is what i get but it dosent seem right 386.40 g at -14 degrees.
 
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Well, how have you gone about solving the problem? Draw a diagram to start, then set up equations; post your work. We can't tell you if you're right if we can't see what you've done!
 

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