Students work in pairs, each with a different set of angles. Students find the values of the six trigonometric functions for special angles. They check their answers with their partner's answers. They must then determine why some answers are the same, and why some answers are different. They must write a summary of their conclusions. I use this as a review before giving a quiz on CA Standard for Trigonometry 9.0.
NOTE: This is the pdf version of the lesson. A Word doc is also available.