Vector Addition

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[SOLVED] Vector Addition

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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First off, lets state the Pythagorean Theorem as a^2 + b^2 = c^2. Cool.

Next since we are using that equation we know that the answer involved has a right angle it it somewhere.

Draw a picture of a right triangle then make it into a rectangle. Draw a line from corner to corner and going threw the other side(the size where the first right angle was) [Broken]

Then play around with the numbers and angles and see if you can come up with the same answer. I hope this helps you out a little bit! Although I am not exactly sure on how to solve it myself.
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I don't have a program that can do any of that stuff?(like the diagram you just did)
Dont you have pen and paper? I did that on my paper before I made it with photoshop o_O
I've figured it out :D Thanks. I simply formed a parallelogram and was able to get the answer.
No prob, Glad you got it!

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