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How to find the angle between F2 and the x axis?

1. Homework Statement
Find the angle between the x axis and the force F2, and the magnitude of the resultant force?


2. Homework Equations
The equation of the triangle:
a(squared) = b(squared) + c(squared) - 2bc cos A


3. The Attempt at a Solution
What I did was that I said that since the angle between the f1 and the negative x-axis is 70 degrees. Then the angle with the +y axis should be 20 degrees, and therefore if we make the whole two forces as a triangle and solve using the cosine rule, we should get the value of the resultant force, but after wasting countless amounts of paper, I still haven't got a solution? Any help will be greatly appreciated!
 

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Answers and Replies

danago
Gold Member
1,122
4
Was there any other information that you have left out? The angle could be anything without extra information.
 
Nope that is all the information given!
 

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