Students discover the trigonometric ratios through measuring the
side lengths of similar triangles and calculating their ratios.
The formal definitions of the sine, cosine, and tangent or an
angle are presented and applied to find the missing side
lengths. Before the Activity Download the attached PDF and look
over the information on the first page. Distribute the Student
Worksheet and attached calculator files for use during the
activity. During the Activity Discuss the material from the
activity pages with students as needed. After the Activity
Encourage students to summarize what they have learned from
completing the activity.