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Trigonometry: Instructor's Guide

Main Ideas

The geometry of trig.

Students' Task

Estimated Time: 5 minutes, including wrap-up

Students should be asked to answer the following questions on their whiteboards:
Write down something you know about trig.

Prerequisite Knowledge

High school trigonometry.



  • Ask several students to present/defend their responses.
  • Emphasize that angles measure (rescaled) arclength.
  • Emphasize that trig functions are coordinates on (unit) circle.

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