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Unformatted text preview: 71.notebook November 18, 2010 Ch. 7 Trigonometry Functions Measurement of angles Dec 710:48 AM Terminal 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. Naming angles introduction 1 71.notebook November 18, 2010 A r arc length = 1r
r θ B
In general, s = θr arc length is s, theta in radians Radian measurement is when an arc of a circle has the same radius measurement. Dec 711:55 AM Converting degrees to radians or radians to degrees. 3600 = 2π 1800 = π So as a conversion factor use either 180/π or π/180 Ex. convert 450 to radians Ex. convert 2π/3 to degrees Dec 712:02 PM 2 71.notebook November 18, 2010 Convert 1960 to radians, nearest hundredths. Convert 1.35 radians to degrees, nearest tenths.
H.W. p.260 12, p.261 110
Dec 712:10 PM Coterminal angles two angles in standard position that have the same terminal ray. Ex. 4050 4050 and 450
0 These are coterminal angles. Feb 1810:15 AM 3 71.notebook November 18, 2010 Ex.
These are coterminal angles. 3150 450 450 and 3150 Feb 1810:23 AM Exs. Find coterminal angles, 1 positive and 1 negative with 2π/3 H.W. p. 260 3,6 p. 261 1114, 17,18
Feb 1810:27 AM 4 ...
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