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Old Mar 26th 2010, 04:29 PM   #1
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Positive/Negative Angle

Hey guys.
Lets say I have the following system

http://img263.imageshack.us/img263/7863/tmpg.jpg

How can I tell which angle is positive and which one is negative? Is there a rule?

Thanks a lot.
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Old Mar 26th 2010, 07:53 PM   #2
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According to the convention, angle measured in counterclockwise is positive and measured in clockwise direction is negative.
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