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Sin, Cos, and Tan Revealed

Module by: Interactive Mathematics Program

Intent

This reference page introduces students to the trigonometric functions of sine, cosine, and tangent. Students investigated these ratios in Right Triangle Ratios.

Mathematics

The three trigonometric functions of sine, cosine, and tangent are defined in this reference page as specific ratios of sides of a right triangle. Students’ introduction to these terms is anchored by the concept of similarity.

Progression

Students review the presented information in a whole-class discussion.

Approximate Time

10 minutes

Classroom Organization

Whole class

Using the Reference Page

Tell students that the ratios within right triangles that they examined in Right Triangle Ratios are part of the branch of mathematics called trigonometry and that each of these ratios has a name. You may want to point out that these ratios are important in part because right triangles are so important.

Have volunteers read aloud sections of the reference page, periodically pausing to make sure students understand what is being said.

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