Java angle of line segment
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![][1]


  [1]: http://i.stack.imgur.com/yFswf.png
I have a line segment (at above picture it's `c`). I want to check what is it's angle between `b` and `c`. Methematically it's just:

    asin(a/c)
but in Java I have a little problem. That's what I do:

    Math.asin(Math.toRadians(a/c));
I read that `Math.asin` expects an argument in radians, that's why I make a convertion. But it still doesn't works! I want result in degrees.

Sorry for my English ;P.