1. Today’s Agenda Homework Review: ◦ Workbook 9.4: 1-8 ◦ Textbook pg 555: 24-27 all. ◦ Textbook pg 799: 18-25 all. ◦ Note pack 9.4 problems Homework ◦ Finish handout from class

2. Trigonometric Ratios (Trig Ratios) For any given acute angle in a right triangle, trigonometric functions are just the ratios of 2 of the side lengths. Three basic Trig functions are: 1. Sine (sin) 2. Cosine (cos) 3. Tangent (tan)

3. SOH-CAH-TOA Who am I? 1.Belonged to the small tribe Hypotens (part of the Shoshone tribe) in western US. 2.Lived in huts with roof that started at the ground and leaned against a tree. 3.Tribe exclusively used sine language 4.Name is legend among both math scholars and students!

4. Sacagawea Shoshone interpreter, member of the Lewisand Clark expedition. Born around 1788. On the gold dollar Who was in the picture?

5. Trigonometric Ratios Trigonometric Ratios (SOH-CAH-TOA) SOH sin A = CAH cos A = TOA tan A = b A C B c a