1. Warm- Up 1. Find the sine, cosine and tangent of  A. 2. Find x. 12 x 51° 6 8 10 A

2. Find the trigonometric ratios. D O G 5 12 13 sin D = tan D = cos D = sin G = tan G = cos G =

3. Find the missing variables. 6 feet 43.2° x y 12.9 25°

4. Finding an angle. (Figuring out which ratio to use and getting to use the 2 nd button and one of the trig buttons.)

5. Let  A be an acute angle in a right triangle. Approximate the measure of  A to the nearest degree sinA=.36 cosA=.42 Let’s practice using the calculator! 2 nd cos.36.42 sin2 nd

6. Ex. 1: Find . Round to four decimal places. 9 17.2 Make sure you are in degree mode (not radian). 2 nd tan 17.29

7. Ex. 2: Find . Round to three decimal places. 23 7 Make sure you are in degree mode (not radian). 2 nd cos 723

8. Ex. 3: Find . Round to three decimal places. 400 200 Make sure you are in degree mode (not radian). 2 nd sin 200400

9. When we are trying to find a side we use sin, cos, or tan. When we are trying to find an angle we use sin -1, cos -1, or tan -1.