# Trig Ratios and Cofunction Relationships. Trig Ratios SOH-CAH-TOA.

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Trig Ratios and Cofunction Relationships

Trig Ratios SOH-CAH-TOA

SINE Pronounced “sign”

Pronounced “co-sign” COSINE

Pronounced “tan-gent” TANGENT

Pronounced “theta” Greek Letter  Represents an unknown angle

Finding sin, cos, and tan. Just writing a ratio.

1. Find the sine, the cosine, and the tangent of theta. Give a fraction. 35 12 37 Shrink yourself down and stand where the angle is. Identify your hypotenuse, adjacent side, and opposite side. H A O

2. Find the sine, the cosine, and the tangent of theta 24.5 23.1 8.2 Shrink yourself down and stand where the angle is. Identify your hypotenuse, adjacent side, and opposite side. H A O

Sin-Cosine Cofunction

The Sin-Cosine Cofunction

3. What is sin A? 4. What is Cos C?

5. What is Sin Z? 6. What is Cos X?

7. Sin 28 = ?

8. Cos 10 = ?

9.  ABC where  B = 90. Cos A = 3/5 What is Sin C?

10. Sin  = Cos 15 What is  ?

Draw  ABC where  BAC = 90  and sin B = 3/5 11. What is the length of AB? 12. What is tan C? 4 4/3

13. Draw stick-man standing where the angle is and mark each given side. Then tell which trig ratio you have. O H sin

Classwork SPW 16.4

Homework Worksheet