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1. The problem statement, all variables and given/known data

Find the angle between two vector forces of equal magnitude, such that the resultant is one-third as much as either of the original forces.

2. Relevant equations

Pythagorean Theorom, I assume

3. The attempt at a solution

This is from Schaum's 3000 Problems in physics, page 7, # 1.35... I don't understand their explanantion thus I dont understand where to begin. Can someone give me a lead?

The answer is 160.8 degrees by the way...

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# Vector Addition

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