1. Warm-Up: Solve each equation

2. Students will define sine, cosine, and tangent ratios in right triangles.

3. Trigonometric Ratios The relationships between the angles and the sides of a right triangle. Trignometric Ratios

4. How do I remember this?

5. Three basic ratios: sine (sin), cosine (cos), tangent (tan) Trigonometric Ratios Theorem Let  ABC be a right triangle. The sine, the cosine, and the tangent of the acute angle  A are defined as follows: sin A = cos A = tan A = AC B a c b

6. It is known that a hill frequently use for sled riding has an angle of elevation of 30 0 at its bottom. If the length of a sledder’s ride is 52.6 feet estimate the height of the hill. 30 0 h 52.6

7. You want to find the height of a tower used to transmit cellular phone calls. You stand 100 feet away from the tower and measure the angle of elevation to be 40 0. How high is the tower? 40 0 100 ft you tower

8. Practice Time!