# Similar Right Triangles and Trig Ratios

##### This Similar Right Triangles and Trig Ratios lesson plan also includes:

Is it possible to be the same yet different? Absolutely! The activity asks learners to explore the relationships between side ratios of triangles they have drawn. Because individuals all draw a triangle with the same angle measures, they have congruent side ratios. This leads to a discussion of sine, cosine, and tangent and their relationship in similar right triangles.

CCSS: Designed

##### Instructional Ideas

• Have pupils record their side ratios in an online format such as a Google document to facilitate the collection of the data
• Repeat the activity with more than one set of similar triangles; use each set of data as a comparison with the trigonometric tables
##### Classroom Considerations

• Required materials include protractors, rulers, unlined paper, and scientific/graphing calculators
##### Pros

• Uses a graphic organizer to record important information
• Emphasizes vocabulary and triangle relationships when defining the trigonometric ratios
##### Cons

• Does not include any application of the new concept