1. 8.3 Trigonometry Trigonometric Ratios – Similar right triangles have equivalent ratios for their corresponding sides.

2. Trigonometric Ratios

3. Using a Trigonometric Ratio to Find Distance In 1990, the Leaning Tower of Pisa was closed to the public due to safety concerns. The tower reopened in 2001 after a 10-year project to reduce its tilt from vertical. Engineers’ efforts were successful and resulted in a tilt of 5°, reduced from 5.5°. Suppose someone drops an object from the tower at a height of 150 ft. How far FROM the base of the tower will the object land? Round to the nearest foot.

4. Inverses If you know the sine, cosine, or tangent ratio for an angle, you can use an inverse (sin -1, cos -1, tan -1 ) to find the measure of the angle. – See Example 3 on p. 509

5. More Practice!!!!! Homework – Textbook p. 510 – 511 #11 – 27 ALL.