You will need a calculator and high lighter!

13.1 Sine, Cosine, and Tangent Ratios

3 Basic Trig ratios: 1. sine (sin) 2. cosine (cos) 3. tangent (tan) Trigonometry comes from the ancient Greek language and means measurement of triangles. 3 Basic Trig ratios: 1. sine (sin) 2. cosine (cos) 3. tangent (tan)

S O H C A H T O A *You can only use trigonometry, sohcahtoa, when you have a RIGHT triangle*

SOHCAHTOA B Z y C x A Sin A = opposite side of <A hypotenuse Cos A = adjacent side of <A Tan A = opposite side of <A adjacent side of <A Sin A = z y Cos A = x Tan A = z x

B 17 15 A 8 C Sin A = Cos A = Tan A = Sin B = Cos B = Tan B =

*Calculator must be in DEGREE mode when using trig! Sin 48°= Cos 13°=

*When you are missing the angle measure, use the inverse (-¹) key Sin X° = 0.5 Cos X° = 0.866

Tear out pages 692-694 & 703-704 p. 692 2-5 p. 703 3-8