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

Problem #199

http://img88.imageshack.us/img88/8008/scan0001vd.jpg [Broken]

Solution

http://img21.imageshack.us/img21/2131/199hg.jpg [Broken]

2. Relevant equations

Why is the angle from V_{B/A }20 degrees from the solution diagram? It would seem that I had to know that direction of V_{B/A}had the same angle as V_{A}in terms of the geometry (if two parallel lines are cut by a transversal, its alternating interior angles are equal). I just don't see how you can assume that.

3. The attempt at a solution

Since drawing a triangle is the first part, I don't have any "attempt" at it yet.

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# Homework Help: Why is this certain angle 20 degrees?

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