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TURN RIGHT, if it falls
upon line (B,F') then GO STRAIGHT, and if it falls upon line (A,B) you're
in trouble because you shouldn't have two roads on top of each other.
In order to find the angle between points A,B, and C you could use the
Law of Cosine or arccos to derive a formula that would give you the answer
OR you could be a savvy Java programming and use one function from the Java API
that gives you the angle. Your choice.