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April 8th, 2009, 11:43 AM   #1
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Positive and negative angles

This diagram is shown in my Trigonometry book and I'm trying to understand it.

Which ray is the initial side? Is it saying that the horizontal ray swivels down it creates a negative angle? And if the ray that is slanted down swivels counterclockwise it creates a positive angle? I'm in my first chapter of this book so it's all new to me. Thanks in advance.

Also another question that's not related to this topic. What does alpha and beta stand for?
For example: find (alpha symbol) if A = 30 degrees
find B if (beta symbol) = 45 degrees
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April 8th, 2009, 01:22 PM   #2
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Re: Positive and negative angles

Standard terminology: Start at any line and go counterclockwise - angle is positive. Go clockwise and angle is negative.

Second question: You need to define the context. Are you talking about a triangle or a circle or something else?
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April 8th, 2009, 08:28 PM   #3
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Re: Positive and negative angles

Thanks for your response.
In context to a triangle.
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April 9th, 2009, 05:03 AM   #4
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http://en.wikipedia.org/wiki/Angle is a good article about angles. Regarding the question that refers to alpha and beta, was a diagram provided that incorporated alpha and beta as labels for two angles?
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