Free Trigonometry Activities - High School Math - First day of school - Introduction to Trigonometry - Where to Start!For the best introduction to trigonometry you want to start by WOWING your class. Before you even mention you are starting trigonometry take them through a real world problem. Click now to find the full details and free trigonometry worksheets! #geometrycoach #geometryactivities #highschoolmath #freegeometrylessons #mathteacher