References
http://www.mathsteacher.com.au/year10/ch15_trigonometry/12_elevation_depression/23elevdep.htm
www.icoachmath.com/math_dictionary/angle_of_depression.html
http://www.mathsisfun.com/sine-cosine-tangent.html
www.MathWorksheetsGo.com
http://www.icoachmath.com/math_dictionary/angle_of_depression.html
http://www.muhsd.k12.ca.us/cms/lib5/CA01001051/Centricity/Domain/547/Trig/13-6%20Law%20of%20Cosines.pdf
http://www.mathwarehouse.com/trigonometry/sohcahtoa-real-world-applications.php
David W. Sabo, 2003 Angle of Elevation/Angle of Depression Page 2
http://www.mathsteacher.com.au/year10/ch15_trigonometry/12_elevation_depression/23elevdep.htm
www.icoachmath.com/math_dictionary/angle_of_depression.html
http://www.mathsisfun.com/sine-cosine-tangent.html
www.MathWorksheetsGo.com
http://www.icoachmath.com/math_dictionary/angle_of_depression.html
http://www.muhsd.k12.ca.us/cms/lib5/CA01001051/Centricity/Domain/547/Trig/13-6%20Law%20of%20Cosines.pdf
http://www.mathwarehouse.com/trigonometry/sohcahtoa-real-world-applications.php
David W. Sabo, 2003 Angle of Elevation/Angle of Depression Page 2