Objective

 To use the half angle formulas to find non-common angle measures around the unit circle. 

Web Resources

http://www.cliffsnotes.com/study_guide/DoubleAngle-and-HalfAngle-Identities.topicArticleId-11658,articleId-11612.html   Notes with Examples on Double & Half Angle

http://www.mathwords.com/h/half_angle_identities.htm        List of the half angle formulas

http://colalg.math.csusb.edu/~devel/IT/main/m05_identities/src/s03_half-angles.html        Notes and Examples

http://www.intmath.com/analytic-trigonometry/4-half-angle-formulas.php        Examples with solutions

Pay Attention to the Following: