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 April 8th, 2009, 11:43 AM #1 Senior Member   Joined: Feb 2008 Posts: 100 Thanks: 0 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
 April 8th, 2009, 01:22 PM #2 Global Moderator   Joined: May 2007 Posts: 6,807 Thanks: 717 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?
 April 8th, 2009, 08:28 PM #3 Senior Member   Joined: Feb 2008 Posts: 100 Thanks: 0 Re: Positive and negative angles Thanks for your response. In context to a triangle.
 April 9th, 2009, 05:03 AM #4 Global Moderator   Joined: Dec 2006 Posts: 20,931 Thanks: 2206 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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