July 3rd, 2009, 08:48 PM
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 | Flow Master | | Join Date: Dec 2007 Location: Zeitgeist
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Quote:
Originally Posted by chengbin  In a line  ,  , where  is the angle. Mr F adds: Between the line and the positive direction of the x-axis.
Here is a formula for you.
Given that  is the angle formed from the line to line  , then  | ..
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