Located at the University of Illinois at Urbana-Champaign, The Office for Mathematics, Science, and Technology Education is primarily interested in creating resources for educators working on these topics. First-time...

Linked essay sketching trigonometry from its beginnings out of the early correspondence between astronomy and mathematics through the 18th century, with 17 references (books/articles). Influential thinkers addressed...

Created by David Smith for the Connected Curriculum Project, the purpose of this module is to study data that may be modeled by sinusoidal functions; in particular, to determine average level, period, frequency,...

This set of videos, created by Salman Kahn of the Kahn Academy, focus on trigonometry. Watch the "Geometry" playlist first if you have trouble understanding the topics covered here, it will certainly be a useful aid. ...

High school or college students taking an introductory trigonometry course may find this site useful. Three modules comprise the site, and each provides an overview of basic concepts. Some of the most common...