**Title:** "I Saw the Sine"

**Description:**
This lesson will provide information that will prove the concept of sine and cosine is equal to the complementary angles of a right triangle. The lesson will examine the proper techniques for writing trigonometric ratios. The lesson will enhance background knowledge of proportions as well as use the terminology of means and extremes.
This lesson results from the ALEX Resource Gap Project.

**Standard(s): **

[MA2015] GEO (9-12) 20: Explain and use the relationship between the sine and cosine of complementary angles. [G-SRT7]