Introduce Sine and Cosine Ratios

  1. Introduce the different ratios of sine and cosine.
  2. Give students a triangle and have them find all ratios with respect to each angle (excluding the right angles, including those explained as not occurring).

Tips and Tools

Highlight Mathematical Practices 6, Attend to Precision, on the Mathematical Practices Rubric.

See Curriki for this lesson on applying the sine and cosine ratios for ideas on designing the lessons for upcoming lessons.