Eric Weisstein and Wolfram Research have built up a staggering number of math reference pages, all of which have extensive notation, diagrams, and examples. The trigonometry section covers basic trigonometry, identities, and angles, and also has material on more advanced topics such as spherical trigonometry, directed angles, and surveying. As with all the MathWorld sites, the information is abstracted and presented with the very advanced student in mind. This resource is part of the Teaching Quantitative Skills in the Geosciences collection. http://serc.carleton.edu/quantskills/
This description of a site outside SERC has not been vetted by SERC staff and may be incomplete or incorrect. If you
have information we can use to flesh out or correct this record let us know.
Part of the Cutting Edge collection. The NAGT/DLESE On the Cutting Edge project helps geoscience faculty stay up-to-date with both geoscience research and teaching methods.