Education Technology

Geometric Representation of Trig Functions

Published on 07/19/2006

Activity Overview

Using similar triangles, a relationship is established between the six trigonometric functions of an angle and simple line segments. These relationships are then confirmed using line segment measurement capabilities of the graphing calculator.

Before the Activity

See the attached Activity PDF file(s) for detailed instructions for this activity.

During the Activity

Follow the procedures outlined in the activity.
Students will:

  • Be able to establish a relationship between trigonometric functions of an angle and simple line segments.
  • After the Activity

  • Review student results:
  • As a class, discuss questions that appeared to be more challenging
  • Re-teach concepts as necessary