If you want to pursue further study of trigonometry, you might find the following links useful:

 

 

http://www.mathforum.org/library/drmath/sets/high_trigonometry.html

 

http://catcode.com/trig/

 

http://aleph0.clarku.edu/~djoyce/java/trig/

 

http://www.mathwizz.com/algebra/trigindex.htm