1. You will need a calculator and high lighter!

2. 13.1 Sine, Cosine, and Tangent Ratios

3. 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)

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

6. 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

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

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

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

14. Tear out pages & p p