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# 7-1 - 71.notebook November18,2010 Ch. Measurementofangles...

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7­1.notebook 1 November 18, 2010 Dec 7­10:48 AM Ch. 7 Trigonometry Functions Measurement of angles Naming angles ­ introduction Terminal Ray Initial Ray θ Theta Degree is common angle measurement. Positive degrees open up counter­clockwise and negative angles open up clockwise. Radian is a second type of measurement.

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7­1.notebook 2 November 18, 2010 Dec 7­11:55 AM A B arc length = 1r In general, s = θ r arc length is s, theta in radians Radian measurement is when an arc of a circle has the same radius measurement. r r θ Dec 7­12:02 PM Converting degrees to radians or radians to degrees. 360 0 = 2 π 180 0 = π So as a conversion factor use either 180/ π or π /180 Ex. convert 45 0 to radians

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